How much heat is evolved if 3.2 g of methane is burnt and if the heat of combustion of methane is -880 kj mol-1 ?

Question

How much heat is evolved if 3.2 g of methane is burnt and if the heat of combustion of methane is -880 kj mol-1 ? (A) 88 kj (B) 264 kj (C) 176 kj (D) 440 kj

Tardigrade Admin · Accepted Answer

16 g CH4 gives 880 kj of heat. 3.2 g CH4 will give (880/16) × 3.2 = 176 kJ

Q. How much heat is evolved if $3.2 g$ of methane is burnt and if the heat of combustion of methane is $- 880 kj m o l^{- 1}$ ?

$88 kj$

$264 kj$

$176 kj$

$440 kj$

$16 g C H_{4}$ gives $880 kj$ of heat.
$3.2 g C H_{4}$ will give $\frac{880}{16} \times 3.2 = 176 k J$

Q. How much heat is evolved if 3.2g of methane is burnt and if the heat of combustion of methane is −880kjmol−1 ?

88kj

264kj

176kj

440kj