Standard enthalpies of formation (kJ mol⁻¹) at 298 K:
C₄H₁₀(g) −125.6 CO₂(g) −393.5 H₂O(l) −285.8 O₂(g) 0
For the complete combustion of butane,
2 C₄H₁₀(g) + 13 O₂(g) → 8 CO₂(g) + 10 H₂O(l)
determine the energy released per gram of butane.
a) ≈ 25 kJ g⁻¹
b) ≈ 50 kJ g⁻¹
c) ≈ 100 kJ g⁻¹
d) ≈ 46 kJ g⁻¹