Question

In the combustion of0.4g ch4 , 0.25kcal of heat is liberated the heat of combustion of ch4 is?

Answer 1

Answer: Enthalpy of combustion of  $CH_4$ is 10 kcal.

Explanation:

Enthalpy of combustion is the amount of heat released when 1 mole of substance is completely burnt in the presence of oxygen.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of}CH_4=\frac{0.4g}{16g/mol}=0.025moles$

0.025 moles of $CH_4$ produces heat = 0.25 kcal

Thus 1 mole of $CH_4$ produces heat= $\frac{0.25}{0.025}\times 1=10 kcal$

Thus Enthalpy of combustion of  $CH_4$ is 10 kcal.