In the combustion of 2.0 g of methane 25 kcal heat is liberated, heat of combustion of methane would be ___________ .

Options

A. 100 kcal
B. 200 kcal
C. 300 kcal
D. 400 kcal

Answer

B

Explanation

`CH_(4)+2O_(2)rarrCO_(2)+2H_(2)O`
Molecular weight of `CH_(4)=12+4=16`
`therefore` On the combustion of 2.0 gm of methane = 25.0 kcal
`therefore` On the combustion of 16.0 gm = `(25xx16)/(2)` = 200 kcal.