Heat of combustion of methane is `- 800 kJ`. What is the heat of combustion for ` 4 xx 10^(-4)` kg of methane ?

Options

A. `-800 kJ`
B. `-3.2xx10^(4) kJ`
C. `-20kJ`
D. `-1600 kJ`

Answer

C

Explanation

`underset(16g)(CH_(4)+2O^(2) to CO_(2) +2H_(2)O,DeltaH_(c)=-800kJ`
`:'` Heat of combustion of ` 4xx10^(-4)` kg `CH_(4)` will be
`=-(800x4xx10^(-4))/(16xx10^(-3))`
`=-20 kJ`