Given that `C+2SrarrCS_(2)DeltaH^(@)f=+117.0KJmol^(-1)` (1)
`C+O_(2)rarrCO_(2)DeltaH^(@)f=-393.0KJmol^(-1)` (2)
`S+O_(2)rarrSO_(2)DeltaH^(@)f=+297.0KJmol^(-1)` (3)
The heat of combustion of `CS_(2)+3O_(2)rarrCO_(2)+2SO_(2)` is

Options

A. `-807KJmol^(-1)`
B. `-1104KJmol^(-1)`
C. `807KJmol^(-1)`
D. `1104KJmol^(-1)`

Answer

B

Explanation

The required combustion equation is obtained as
`2xxeqn.(3)2S+2O_(2)rarr2SO_(2)2xx(-297.0)KJ`
`+eqn.(2)+C+O_(2)rarrCO_(2)+(-393.0)KJ`
`-eqn.(1)-C-2Srarr-CS_(2)-(+117.0)KJ`
or we get `2S+3O_(2)-2Srarr2SO_(2)+CO_(2)-CS_(2)`
or `CS_(2)+SO_(2)rarrCO_(2)+2SO_(2)(-1104KJmol^(-1))`