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Compound ∆Hf (kJ/mole) ∆S (J/mole K) C2H4 52.4 219.3 C2H6 –84.68 229.2 SiO2 –910.7 41.5   HF –273.3 173.8 SiF4 –1615.0 282.8 NH3 –45.9 192.9 O2 1.88 2.43 NO 91.3 210.8 H2O(g) –241.8 188.8 For the following reactions, using the provided ∆H and ∆S data, determine whether each one would be spontaneous or nonspontaneous at 25°C. C2H4(g) + H2(g) --------à                                  C2H6(g)                 SiO2 + 4 HF(g) ------------->             SiF4 (g) + 2 H2O(g)               4 NH3(g)  +  5 O (g)  ---------> 4 NO(g) + 6 H2O(g)

Compound ∆Hf (kJ/mole) ∆S (J/mole K) C2H4 52.4 219.3 C2H6 –84.68 229.2 SiO2 –910.7 41.5   HF –273.3 173.8 SiF4 –1615.0 282.8 NH3 –45.9 192.9 O2 1.88 2.43 NO 91.3 210.8 H2O(g) –241.8 188.8 For the following reactions, using the provided ∆H and ∆S data, determine whether each one would be spontaneous or nonspontaneous at 25°C. C2H4(g) + H2(g) --------à                                  C2H6(g)                 SiO2 + 4 HF(g) ------------->             SiF4 (g) + 2 H2O(g)               4 NH3(g)  +  5 O (g)  ---------> 4 NO(g) + 6 H2O(g)

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter11: Solutions
Section: Chapter Questions
Problem 84AP
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Question

Compound

∆Hf (kJ/mole)

∆S (J/mole K)

C2H4

52.4

219.3

C2H6

–84.68

229.2

SiO2

–910.7

41.5

 

HF

–273.3

173.8

SiF4

–1615.0

282.8

NH3

–45.9

192.9

O2

1.88

2.43

NO

91.3

210.8

H2O(g)

–241.8

188.8
  1. For the following reactions, using the provided ∆H and ∆S data, determine

whether each one would be spontaneous or nonspontaneous at 25°C. C2H4(g) + H2(g) --------à                                  C2H6(g)

 

 

 

 

 

 

 

 

SiO2 + 4 HF(g) ------------->             SiF4 (g) + 2 H2O(g)

 

 

 

 

 

 

 

4 NH3(g)  +  5 O (g)  ---------> 4 NO(g) + 6 H2O(g)

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