The reaction of 1.00 mole of H2(g) with 0.500 mole of O2(g) to produce 1.00 mole of steam, H2O(g), at 100°C and 1.00 atm pressure evolves 242 kJ of heat. Calculate ΔE per mole of H2O(g) produced. The universal gas constant is 8.314 J/mol·K.
a. +240 kJ
b. -240 kJ
c. +242 kJ
d. -242 kJ
e. -238 kJ