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Q.

 Given C + 2S → CS2,  large Delta H_f^0=+117.0 kJ mol–1
C + O2 → CO2, large Delta H_f^0 = – 393.0 kJmol–1
S + O2 → SO2, large Delta H_f^0  = – 297.0 kJmol–1
The heat of combustion of CS2 + 3O2 → CO2 + 2SO2 is

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a

-807 KJ mol-1

b

-1104KJ mol-1

c

+1104KJ mol-1

d

+807 KJ mol-1

answer is B.

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Detailed Solution

begin{array}{l} {Delta _C}H(C{S_2}) = [{Delta _f}H(C{O_2}) + 2{Delta _f}H(S{O_2})] - [{Delta _f}H(C{S_2}) + 3{Delta _f}H({O_2})\ ,,,,,,,,,,,,,,,,,,,,,,,,,, = [ - 393 + 2( - 297)] - [ + 117 + 3(0)]\ ,,,,,,,,,,,,,,,,,,,,,,,,,, = - 393 - 594 - 117 = - 1104KJ/mole end{array}

 

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