Given the information in this chart, which of the following answers best represents the enthalpy of combustion for hydrogen gas, in kJ/mol?

Substance
DHf º (kJ/mol)
H2 (s)
0
CO2 (g)
–393.5
H2O (l)
–285.85
O2 (g)
0

0
–393
–107
–285
+107