In a calorimeter, the temperature increases by 6.12 K, the heat capacity of the system is `1.23 kJg^(-1)K^(-1) .` What is the molar heat of decomposition for `NH _(4) NO_(3)`?

Options

A. `-7.53.kJ/mol`
B. `-398.1 kJ/mol`
C. `-16.1 kJ/mol`
D. `-602 kJ/mol `

Explanation

Molecular weight of `NH _(4) NO _(3) = 80 g mol ^(-1)`
`therefore `Molar heat of decomposition, ` H = m s Delta t = 80 xx 1. 23 xx 6. 12 = 602 kJ // mol`