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what is the enthalpy for reaction 1 reversed? reaction 1 reversed: 2co2 + 3h2o→c2h5oh + 3o2

What is the enthalpy for reaction 1 reversed?
14,146 results
chemistry
What is the enthalpy for reaction 1 reversed? reaction 1 reversed: 2CO2+3H2O=C2H5OH+3O2 express the answer in kJ/mol

asked by Lilit*** on October 19, 2008
Chemistry due soon
What is enthalpy? A. Enthalpy is the kinetic energy of a system. B. Enthalpy is the heat involved in a reaction. C. Enthalpy is the temperature of a reaction. D. Enthalpy is the mass involved in a reaction. I think the answer is a or b

asked by Morgan on November 6, 2014
chemistry
Calculate the enthalpy of reaction for the combustion of ethene. Express the enthalpy of reaction calculated in question above as a molar enthalpy of reaction per mole of carbon dioxide.

asked by shyanne on January 8, 2013
Chemistry
Which of the following is the best definition of Hess’ Law? A. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements. B. The enthalpy of a process is the difference between the enthalpy of the products and the

asked by Anonymous on February 20, 2008
Hess’ law
Which of the following is the best definition of Hess’ Law? A. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements. B. Since enthalpy is a state function, it will be different if a reaction takes place in one

asked by christine on February 9, 2007

Chemistry
Which of the following is the best definition of Hess’ Law? A. Heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest. B. The enthalpy of a process is the difference

asked by Jared on May 7, 2007
Chemistry
Which of the following is the best definition of Hess’ Law? A. Since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps. B. Heat is always released by the decomposition of 1 mole of a compound into

asked by Anonymous on February 24, 2008
Chemistry
The enthalpy of formation for a substance corresponds to the enthalpy change for a reaction. Write the specific chemical reaction defining the enthalpy of formation of butane: Just checking to make sure this is correct: 4C + 5H2 —> C4H10

asked by AJ on March 26, 2017
Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The

asked by Mark on November 22, 2008
Chemistry
The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction a) Write the equation for the reaction which occurs.

asked by Sean on June 3, 2009
Chemistry
Given the following equations: 2 H2 (g) + O2 (g)–> 2 H2O (l) deltaH = -571.6 kJ N2 (g) + O2 (g)–>2 NO (g) deltaH = +180.5 kJ N2 (g) + 3 H2 (g) —>2 NH3 (g) deltaH = -92.22 kJ Determine the enthalpy change (deltaH) for the following reaction: 2 NO (g) +

asked by Katherine on October 8, 2009
Chemistry practice
Using the form of energy diagram,make a concept map of the two different methods of calculation of reaction enthalpy(via the bond enthalpy and via the enthalpy of formation)

asked by Gift on July 31, 2011
Chemistry
When a chemist burns ammonia according to the reaction below she finds that the reaction releases heat. (It is exothermic.) 4NH3(g) + 3O2(g) 2N2(g) + 6H2O(g) The enthalpy of the reaction DH = -1267 kJ. What is the enthalpy change (in kJ) when 7 grams of

asked by Devin on January 12, 2015
Chemistry
O3 + NO –> O2 + NO2 (all in gas state) Calculate the change in enthalpy for the reaction at room temp. using the following data ^Hf: O3 = 143 NO = 90 NO2 = 33 So, I have 143+90–> X + 33. I don’t know what the enthalpy of O2 is. I assume you simply

asked by Anonymous on February 18, 2008
chemistry-Thermochemistry (grade 12)
calculate enthalpy of H for the reaction N2H4(l) + 2H2O(l) -> N2(g) + 4H2)(l) Given the reactions N2H4(l) + O2(g) -> N2(g) + 2H2O(l) Enthalpy of H = -6.22.2 kJ H2(g) + (1/2)O2(g) -> H2O(l) enthalpy of H = -285.8 kJ/mol H2(g) + O2(g) -> H2O2(l) enthalpy of

asked by Rose Bud on February 16, 2012

chemistry-Thermochemistry (grade 12)
calculate enthalpy of H for the reaction N2H4(l) + 2H2O(l) -> N2(g) + 4H2)(l) Given the reactions N2H4(l) + O2(g) -> N2(g) + 2H2O(l) Enthalpy of H = -6.22.2 kJ H2(g) + (1/2)O2(g) -> H2O(l) enthalpy of H = -285.8 kJ/mol H2(g) + O2(g) -> H2O2(l) enthalpy of

asked by Rose Bud on February 16, 2012
chemistry
The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction a) Write the equation for the reaction which occurs.

asked by Anonymous on November 10, 2008
CHEMISTRY
1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) 2.Do

asked by Cha-Ching on December 16, 2011
Chemistry – Enthalpy reactions
What is the reaction enthalpy for CaCO3(s) –> CaO(s) + CO2(g)? should i be using a enthalpy reaction table?

asked by Rose Bud on February 29, 2012
Chem
Change in enthalpy problem. Consider the reaction represented below. Referring to the data in the table below, calculate the standard enthalpy change for the reaction at 25 degrees C. O3(g)+NO(g)–>O2(g)+NO2(g) Standard enthalpy of formation in kJ/mol:

asked by Dan on November 19, 2007
Chemistry-College
S(rhombic)+O2(g)—>SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)—>SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)–>S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Lucy on October 31, 2010
Chemistry- please help ASAP!!!! thank you
S(rhombic)+O2(g)—>SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)—>SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)–>S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Annabelle on October 31, 2010
College (Enthalpy) – College
S(rhombic)+O2(g)—>SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)—>SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)–>S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Lucy on October 31, 2010
chemistry
Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it’s negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction

asked by Alex on April 20, 2010
help help help chemistry
why will no one answer this question? For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction

asked by john117 on February 27, 2012

chemsitry
c. Use the enthalpy diagram provided above and apply Hess’s Law to determine the standard enthalpy of formation for C12O36H20N12 (s) using the results from part (a) and the following values: The standard enthalpy of formation of gaseous carbon dioxide is

asked by Nora on October 23, 2010
chemistry
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than

asked by john117 on February 27, 2012
chemistry
The enthalpy change for the following reaction is -483.6 kJ: 2H2(g) + O2(g) = 2H2O(g) Therefore, the enthalpy change for the following reaction is _ kJ: 4H2(g) + 2O2(g) = 4H2O(g)

asked by danny on January 31, 2015
chemistry
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than

asked by bob on February 24, 2012
chemistry
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than

asked by bob on February 25, 2012
Chemistry
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than

asked by Mohamed on March 1, 2012
chemistry
2.9 The standard enthalpy of formation of the metallocene bis(benzene)chromium was measured in a calorimeter. It was found for the reaction Cr(C6H6)2(s) → Cr(s) + 2 C6H6(g) that . Find the corresponding reaction enthalpy and estimate the standard

asked by girlgirl on June 18, 2011
Chemistry
Nitrogen and oxygen can react directly with one anotheer to produce nitrogen dioxide according to N2(g) + 2O2(g) –> 2NO2(g) The reaction may also be imagined to take place by first producing nitrogen oxide N2(g) + O2(g) –> 2NO(g) which then produces NO2

asked by Sarah on November 12, 2015
Chemistry help
I am not to sure how to approach the problem… Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g) ==> N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction

asked by Anonymous on May 11, 2014
Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015

CHEMISTRY!!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
chemistry help!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
chemistry help!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by mark on October 26, 2015
chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
chemistry help!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 25, 2015
CHEMISTRY!!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the

asked by Mark on October 26, 2015
Chemistry
How is the enthalpy change for a reaction related to the enthalpy of the reactants and products? Is it that the enthalpy for the reactants and products equals the enthalpy change for the reaction?

asked by Anonymous on July 9, 2015
Chemistry
Please show me how to work! thanks When Snno2(s) is formed form the comustion of gray tin, the reaction enthalpy is -578.6 kJ, and when white tin is burned to form SnO2(s), the reaction enthalpy is -580.7 kJ. Calculate the reaction enthalpu for

asked by Sam on October 20, 2012
college chemistry
for the reaction at 298 K 2A+b —->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K

asked by thomas on May 9, 2015

Chem
I was given a problem that my book did not explain how to do, so I attempted to figure it out myself. Let me know if my conclusion is fallacious. Given the reactions H2O(g) + CO(g) H2(g) + CO2(g), K= 1.6 FeO(s) + CO(g) Fe(s) + CO2(g), K= .67 Find K for the

asked by Chris on April 9, 2007
Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The

asked by Mark on November 23, 2008
Chemistry-Dr.Bob
Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in

asked by Sanaya on January 10, 2016
chemistry
give enthalpy profile diagrams to illustrate endothermic and exothermic reactions. include an explanation of cocepts such as enthalpy change, activation energy and catalysts.explain how the process of bond breakage and formation determine the enthalpy

asked by ABRAHAM on February 2, 2011
Chemistry
If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the

asked by Alexis on April 20, 2014
AP Chem
Reaction 1: NaOH + HCL –> H20 + NaCl delta H of -100.332 kj/mol Reaction 2: NaOH + NH4Cl –> NH3 + H20 : delta H of 358.639 kj/mol Reaction 3: HCl + NH3 –> NH4Cl : delta H of -51.701 kj/mol Use your answers from question 2 above and Hess’s law to

asked by Serena on October 13, 2014
chemistry
is this the answer to B ) CH3CH2OH + 3O2 → 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are “burned” to water vapor andCO2. Write a combustion

asked by Mark on October 27, 2015
Chemistry
If the standard enthalpy of formation of PH3(g) is +5.4 kJ mol-1, calculate the reaction enthalpy for 2PH3(g)—>2P(s)+3H2(g)

asked by Sam on October 20, 2012
Chemistry – Enthalpy change and stoichiometry
N2 + O2 = 2NO enthalpy change = +180.6kJ c) what is the enthalpy change for the formation of one mole of nitrogen monoxide? d) What is the enthalpy change for the reaction of 1.000 * 10^2g of nitrogen with sufficient oxygen? I do not understand how to

asked by Farah on February 23, 2011
chemistry
State whether each of the following will increase,decrease or unchange when catalyst is added to the reaction and give an explanation for your answer please a) rate of reaction b)activation energy c)reaction enthalpy d)equilibrium of reaction

asked by Gift on July 9, 2011

Chemistry!
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The

asked by Elizabeth on November 23, 2008
Chemistry
Reposted: Use Hess’s law to calculate the enthalpy change for the reaction: 3C(s) + 3H2(g) yield C3H6(g) Given the following thermochemical equations: 2C3H6(g) + 9O2(g) yield 6CO2(g) + 6H2O(l) enthalpy change= -4116.0 kJ/mol C(s) + O2(g) yield CO2(g)

asked by Hailee on March 17, 2012
chemistry… HELP !!!!!!!
The average bond enthalpy for C__H is 413 kJ/mol. In other words, 413 kJ of energy is required to break a mole of CH into atoms: CH (g) —-> C(g) + H(g) delta H= 413 kJ Using this information, and enthalpy of C6H6=5535kJ, calculate the enthalpy change of

asked by sarah on November 18, 2012
chemistry
For the reaction shown below complete the following calculations. H2(g) + C2H4(g) –> C2H6(g) (a) Estimate the enthalpy of reaction using the bond energy values in Table 9.4. (b) Calculate the enthalpy of reaction, using standard enthalpies of formation.

asked by hannah on October 27, 2008
Chem please help
If the following reaction: NO(g) + 1/2O2(g) NO2(g) has the following enthalpy change: H° = -56 kJ/mol What is the enthalpy of the decomposition reaction of 2 moles of NO2? A. 112 kJ B. 56 kJ C. -56 kJ D. -112 kJ i think the answer is d

asked by Morgan on November 7, 2014
Chemistry due soon
If the following reaction: NO(g) + 1/2O2(g) NO2(g) has the following enthalpy change: H° = -56 kJ/mol What is the enthalpy of the decomposition reaction of 2 moles of NO2? A. 112 kJ B. 56 kJ C. -56 kJ D. -112 kJ i think the answer is d

asked by Morgan on November 7, 2014
Chemistry
Consider the isomerization equlibria of an alkene (C4H8) that co-exists as three isomers. (These 3 are in an equlibrium triangle) Reaction 1: cis-2-butene ⇔ trans-2-butene Reaction 2: cis-2-butene ⇔ 2-methylpropene Reaction 3: trans-2-butene ⇔

asked by Gleb on March 3, 2013
Chemistry
Calculate enthalpy of reaction C2H4 + H2 gives C2H6.enthalpy of combustion of ethene, H2,and ethane are -1410,-286,-15.60kj/mol respectively

asked by Shaika on November 7, 2016
gen Chem
I’ve attempted this problem but not sure if i’m on the right track. Use the enthalpy diagram provided above and apply Hess’s Law to determine the standard enthalpy of formation for C12O36H20N12 (s) using the results from part (a) and the following

asked by Vince on October 26, 2010
chemistry
How to calculate enthalpy change of the following reaction? : S + 2h2o >>> so2 + 2h2 given: s+o2 >>> so2 – enthalpy change = -296.8 kJ h2 + 1/2o2 >> h20 enthalpy change= -285.8kj I was trying to solve it myself but i got confused.. i know i have to change

asked by olexandra on April 19, 2010

Chemistry VERY DIFFICULT
Imagine you have been given a series of materials to react together and the following enthalpy change data has been recorded. Explain the terms exothermic and endothermic, and identify which of the following are exothermic and endothermic reactions. Ensure

asked by Jack on January 10, 2017
Chemistry
I’m trying to calculate the enthalpy of the reaction Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2 (g) however I cannot find the enthalpy of the compound MgCl2 (aq) and I cannot calculate the total enthalpy without it

asked by Kirstie on March 27, 2011
Chemistry
The following reaction has a standard enthalpy of reaction of -146.0 kJ/mol: Cu2O(s) + 1/2 O2(g) -> 2CuO(s) The standard enthalpy of formation of Cu2O(s) is -168.6 kJ/mol. What is the standard enthalpy of formation of CuO(s)?

asked by James on March 11, 2011
Chemistry

  1. The delta Hf of an element in its standard state is defined to be a) 0 kJ/mol b) 10 kJ/mol c) -10 kJ/mol d) greater than 0 kJ/mol e) a unique value for each element I am assuming its a? 2. Which of the following statements are true? I) The reaction

asked by Bobby on July 21, 2010
chemistry
A 114g sample of sucrose undergoes incomplete combustion according to the reaction C12H22011 + 5O2 —> 4C + 6CO + 2CO2 + 11H2O using the chart of enthalpies of formation determine the enthalpy released by the sample i think that it is a simple enthalpy

asked by rick on July 25, 2010
Chemistry Dr. BOB
I don’t get it!! In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for ethanol. I need help with

asked by Mark on October 27, 2015
chemistry BOB
is this the answer to B ) CH3CH2OH + 3O2 → 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are “burned” to water vapor andCO2. Write a combustion

asked by Mark on October 27, 2015
general chemistry
A sample consisting of 0.025 mol of a solid compound is placed inside a metal cylinder. The cylinder was immersed in a water bath consisting of 10.00 kg of water at an original temperature of 25.00 °C. When the compound decomposes, the temperature of the

asked by Nora on October 23, 2010
Chemistry – Science (Dr. Bob222)
Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g)  N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were produced in the gaseous rather than

asked by Ana on May 8, 2014
Chemistry
Consider the following reaction: H2(g) + I2(s) —> 2HI(g) TriangleH = 51.9 kj (enthalpy) Calculate the standard enthalpies of reaction for the following reaction: 6HI(g) —> 3H2(g) + 3I2(s) Thanks!

asked by Sandy on April 28, 2012

chemistry
If you need to multiply the following reaction by 2 to be an intermediate reaction in a Hess’s law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction? C2H4 + 3 O2 2 CO2 + 2 H2O, H = -1410 kJ

asked by Anonymous on November 24, 2014
Chemistry
What is the enthalpy change for the first reaction? Fe2O3(s) → 2Fe(s) + 3/2O2(g) ΔH = 4Fe(s) + 3O2(g) → 2Fe2O3 (s) ΔH = -1,652 kJ I think I’m supposed to rearrange the equation and double everything but enthalpy isn’t my strong suit

asked by Hahn on October 7, 2014
Chemistry
Assuming the dissolution of borax in water is a spontaneous reaction, do you expect the change in enthalpy to be positive or negative or are both signs possible? Explain your answer A. Neither, enthalpy does not change, the positive entropy for the

asked by Linda on May 7, 2007
Chemistry
Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3 I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 – Enthalpy is 160.9 kj H2 + 1/2O2 = H2O – Enthalpy is -285.8 kj Fe2O3 + 3H2O = 2Fe(OH)3 – Enthalpy is 288.6 I try using Hess Law but cannot solve it.

asked by Shadow on May 13, 2013
Chemistry
The lab we are doing is: Determining the ENTHALPY of a Chemical Reaction. There are three reactions. Reaction 1: NaOH + HCl, Reaction 2: NaOH + NH4Cl, and Reaction 3: HCl + NH3. I found the max temp, initial temp, and temp change of each reaction. Can you

asked by Rina on October 29, 2017
chemistry DR BOB
is this the answer to B ) C2H5OH(liq)+ 3O2(g) –> 2CO2(g) +3H2O(liq) In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are “burned” to water vapor andCO2. Write a

asked by Mark on October 27, 2015
chemistry DR BOB!
is this the answer to B ) C2H5OH(liq)+ 3O2(g) –> 2CO2(g) +3H2O(liq) In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are “burned” to water vapor andCO2. Write a

asked by Mark on October 27, 2015
CHM1045
NH4NO3(s) right arrow NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction, 1.21 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid

asked by Philip Golden on March 30, 2013
chemistry
Find the false statement(s) about the thermochemistry experiment in which nitric acid is reacted with sodium hydroxide, and the enthalpy of the reaction is measured using an ice calorimeter. i. Regardless of which strong acid and strong base are used for

asked by Anonymous on November 16, 2008
chemistry Dr BOB
is this right? C2H6O + 3O2 = 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are “burned” to water vapor andCO2. Write a combustion reaction for

asked by Mark on October 27, 2015

chem please help drbob222
In the roasting of zinc ore, the total enthalpy for the reactants is -412.0 kJ and the total enthalpy for the products is -1294.54 kJ. What is the enthalpy for the roasting reaction? A. 882.54 kJ B. -1706.54 kJ C. 1706.54 kJ D. -882.54 kJ I think the

asked by Morgan on November 25, 2014
Thermochemistry
I’m confused about the difference between the q in q=mc(Tf-Ti) and (Delta)H, or enthalpy. What exactly does enthalpy mean and how is that different than q? (I’m also confused about what Gibbs Free Energy actually means; I know that if it’s negative, the

asked by Kevin on December 2, 2008
chemistry
a) Describe how to determine if a reaction will be thermodynamically favorable. b) Describe what happens to the Gibbs Free Energy term when a chemical reaction is reversed. c) Describe how coupling reactions are used to drive an unfavorable chemical

asked by Morgan on March 12, 2015
CHEMISTRY
AT 25 DEGREES CELSIUS THE STANDARD ENTHALPY OF COMBUSTION OF GASEOUS PROPANE IS -2219.0 KJ PER MOLE OF PROPANE AND THER STANDARD ENTHALPY OF GASEOUS PORPYLENE IS -2058.3 KJ PER MOLE OF P[ROPYLENE. wHAT IS THE STANDARD ENTHALPY CHANGE FOR THE FOLLOWING

asked by Anonymous on July 23, 2011
Chemisty
I need a recap of how to do the question below. I just need the basic guidelines: The enthalpy change for the reaction 2H2(g)+O2 > 2H2O is -571.6kJ. Determine the enthalpy change for the decomposition of 24.0g H2O.

asked by Todd on June 26, 2015
chemistry kinetics
Statement-I : For an endothermic reaction, the activation energy is less than the change in enthalpy. Statement-II: Activation energy of a reaction, at a given temperature can never be greater than its change in enthalpy are these statements true? give

asked by swa on May 24, 2012
chemistry
NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid

asked by DeeDee on November 16, 2012
Chemistry
In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data:

asked by Raj on December 1, 2007
Chemistry
If calcium carbide has a standard enthalpy of formation of -59.8 kJ/mol and acetylene has a standard enthalpy of formation of 226.73 kJ/mol, what is the standard enthalpy change for the reaction?

asked by Kelly on February 20, 2013
chemistry
2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g) a. Determine the enthalpy change for the reaction. ΔH = (4(-393.5)+ 2(-241.8)) – (2(227) + 5(0)) The enthalpy change is -2511.6. b. Determine the entropy change for the reaction. ΔS = (4(213.7)+ 2(188.7)) –

asked by Morgan on January 31, 2015

Chemistry
I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE…. BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS

asked by Anonymous on November 14, 2013
CHEMISTRY
I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE…. BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS

asked by Anonymous on November 14, 2013
chemistry, please help
2NO2(g)–> 2NO(g) + O2(g) , H=+114.2kJ (Note: H, S, G all have a degree sign next to them) NO: H(enthalpy)=90.3kJ/mol, S(entropy)=210.7J/mol*K, G(gibbs energy)=86.6 O2: H(enthalpy)=0, S(entropy)=?, G(gibbs energy)=0 kJ/mol NO2: H(enthalpy)=33.2, S=239.9,

asked by apoorva on February 4, 2008
Science
The enthalpy change for the reaction 2 H2 + O2 > 2 H20 is -571.6 kJ. Determine the enthalpy change for the decomposition of 24.0g H2O. My Process -571.6 is the enthalpy of 2 mols of H2O. So the enthalpy of 1 mol of H2O will be -285.8. Since it’s

asked by Mike on July 9, 2015
Chemistry
From your experience, predict which of the following reactions are spontaneous. a) Zn(s) + 2H+(aq)–> Zn+2(aq) + H2 (g) b) CaCO3(s) + 2H2O(l) –> Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) –> CO2(g) + 2H2O(g) d) Ag+(aq) + Cl-(aq) –> AgCl (s) Our book

asked by Chris on February 14, 2007