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

Given that `C+2SrarrCS_(2)DeltaH^(@)f=+117.0KJmol^(-1)` (1) `C+O_(2)ra

1.	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)` isA. `-807KJmol^(-1)`B. `-1104KJmol^(-1)`C. `807KJmol^(-1)`D. `1104KJmol^(-1)`
Answer» Correct Answer - C 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))`

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