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 4 NH3 + 5 O2 -> 4 NO + 6 H2O

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 4 NH3 + 5 O2 -> 4 NO + 6 H2O

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter4: Energy And Chemical Reactions

Section: Chapter Questions

Problem 64QRT

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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

4 NH3 + 5 O2 -> 4 NO + 6 H2O

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