APFIVE Enthalpy of Reaction Using Hess's Law
Given the standard enthalpy changes for the following reactions:
C(s) + 2H₂(g) → CH₄(g) ΔH° = -74.8 kJ
C(s) + O₂(g) → CO₂(g) ΔH° = -393.5 kJ
2H₂(g) + O₂(g) → 2H₂O(g) ΔH° = -483.6 kJ
What is the standard enthalpy change, ΔH°, for the reaction represented below?
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
A
-74.8 kJ
B
+802.3 kJ
C
-802.3 kJ
D
-951.9 kJ
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