The combustion enthalpies of carbon, hydrogen and methane are −395.5 kJ mol⁻¹, −284.8 kJ mol⁻¹ and −890.4 kJ mol⁻¹ respectively at 25°C. The value of standard formation enthalpies of methane at that temperature is
A
890.4 kJ mol⁻¹
B
−298.8 kJ mol⁻¹
C
−74.7 kJ mol⁻¹
D
−107.7 kJ mol⁻¹

Question

The combustion enthalpies of carbon, hydrogen and methane are −395.5 kJ mol⁻¹, −284.8 kJ mol⁻¹ and −890.4 kJ mol⁻¹ respectively at 25°C. The value of standard formation enthalpies of methane at that temperature is

A

890.4 kJ mol⁻¹

B

−298.8 kJ mol⁻¹

C

−74.7 kJ mol⁻¹

D

−107.7 kJ mol⁻¹

Accepted Answer

−74.7 kJ mol⁻¹

Answer

890.4 kJ mol⁻¹

Answer

−298.8 kJ mol⁻¹

Answer

−107.7 kJ mol⁻¹

AIIMS 2000 Chemistry Enthalpy of Formation MCQ Question

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