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Question

In the reaction CS2 (l)+3O2 (g)CO2 (g)+2SO2 (g)    H=265 kcal
The enthalpies of formation of CO2 and SO2 are both negative and are in the ratio 4 : 3. The enthalpy of formation of CS2 is + 26 kcal/mol. Calculate the enthalpy of formation of SO2.


A
- 90 kcal/mol
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B
-52 kcal/mol
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C
-78 kcal/mol
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D
-71.7 kcal/mol
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Solution

The correct option is D -71.7 kcal/mol
CS2 (l)+3O2 (g)CO2 (g)+2SO2 (g)     H=265 kcal
Let Hf(CO2,g)=4x   and   Hf(SO2,g)=3x
Hreaction=Hf(CO2,g)+2 Hf(SO2,g)Hf(CS2,l)
265=4x6x26
x=+23.9
 Hf(SO2,g)=3x=71.7 kcal/mol.

Chemistry

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