Question

What is the change in internal energy for \[\ce{2CO_{(g)} + O2_{(g)} -> 2CO2_{(g)}}\] at 25°C?

(R = 8.314 J K⁻¹ mol⁻¹, ΔН = −560 kJ)

Options

• −557.5 kJ

• −530.0 kJ

• 510.0 kJ

• 656.9 kJ

Answer 1

−557.5 kJ

Explanation:

ΔH = ΔU + ΔnRT

−560 = ΔU + (1 × 8.314 × 298)

∴ ΔU = −557.5 kJ