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  4. 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 ?

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

Thermodynamics

Solution:

$16\, g\, CH_4$ gives $880\, kj$ of heat.
$3.2\, g \,CH_4$ will give $\frac{880}{16} \times 3.2 = 176\,kJ$