Question

In the combustion of 4g of $C{H}_4$, 2.5 Kcal of heat is liberated. The heat of combustion of $C{H}_4$ is:

• A. 20 Kcal.
• B. 10 Kcal.
• C. 2.5 Kcal.
• D. 5 Kcal.

Answer 1

Answer: (B)

10 Kcal.

Solution:- (B) $10Kcal$

Mol. wt. of methane $=16gm$

Heat liberated during the combustion of $4gm$ methane $=2.5kcal$

Heat liberated during the combustion of $16gm$ methane $=\frac{2.5}{4}\times 16=10kcal$

Hence the heat of combustion of methane is $10Kcal$.