C₂H₆(g) + O₂(g) → 2CO₂(g) + 3H₂O(l) ΔH° = –1560 kJ
C(graphite) + O₂(g) → CO₂(g) ΔH° = -394 kJ
Given the equations and the values of ΔH° for the combustion of C₂H₆(g) and the combustion of C(graphite) represented above, which of the following additional information is needed to determine the values of ΔH° for the overall reaction 2C(graphite) + 3H₂(g) → C₂H₆(g)?
a) C(diamond) + C(graphite) ΔH° = –2 kJ
b) C₂H₄(g) + H₂(g) → C₂H₆(g) ΔH° = -134 kJ
c) H₂(g) + ½O₂(g) → H₂O(g) ΔH° = –286 kJ
d) H₂O(l) → H₂O(g) ΔH° = +41 kJ
