Thermodynamics — Easy JEE chemistry MCQ
The enthalpy of combustion of methane is \(-890\) kJ/mol. If \(8\) g of methane is completely burnt, the heat released is (Molar mass of CH₄ = 16 g/mol):
- A. 222.5 kJ
- B. 445 kJ
- C. 890 kJ
- D. 1780 kJ
Solution
Number of moles of methane:
\[
n = \frac{8}{16} = 0.5\,\text{mol}
\]
Heat released:
\[
Q = n \times |\Delta H_c| = 0.5 \times 890 = 445\,\text{kJ}
\]
So the correct option is B.