Question

How much heat is evolved if $3.2$ g of methane is burnt and if the heat of combustion of methane is $- 880kJmol^{- 1}?$

• A. 88 kJ
• B. 264 kJ
• C. 176 kJ
• D. 440 kJ

Answer 1

Answer: (C)

176 kJ

Answer 2

: 16 g $CH_{4}$gives 880 kJ of heat.

$3.2gCH_{4}$will give, $= \frac{880}{16} \times 3.2 = 176kJ$