Problem 8.71 Using bond enthalpies (Table 8.4 in the textbook), estimate H for e

Question

Problem 8.71

Using bond enthalpies (Table 8.4 in the textbook), estimate H for each of the following reactions.

Part A

2CH4(g)+O2(g)2CH3OH(g)

-321

SubmitMy AnswersGive Up

Correct

Part B

H2(g)+Br2(g)2HBr(g)

-103

SubmitMy AnswersGive Up

Correct

Part C

2H2O2(g)2H2O(g)+O2(g)

495

SubmitMy AnswersGive Up

Incorrect; Try Again

Problem 8.71

Using bond enthalpies (Table 8.4 in the textbook), estimate H for each of the following reactions.

Part A

2CH4(g)+O2(g)2CH3OH(g)

H =

-321

  kJ  

SubmitMy AnswersGive Up

Correct

Part B

H2(g)+Br2(g)2HBr(g)

H =

-103

  kJ  

SubmitMy AnswersGive Up

Correct

Part C

2H2O2(g)2H2O(g)+O2(g)

H =

495

  kJ  

SubmitMy AnswersGive Up

Incorrect; Try Again

Explanation / Answer

from the standard data

2H2O2(g)   ----> 2H2O(g) + O2(g)

DH0rxn = (2*DH0fH2O(g) + 1*DH0fO2) - (2*DH0fH2O2)

       = (2*-241.8 + 1*0) - (2*-136.11)

       = -211.38 kj

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---