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Question

# S+O2→SO2;ΔH=−298.2kJSO2+12O2→SO3;ΔH=−98.7kJSO3+H2O→H2SO4;ΔH=−130.2kJH2+12O2→H2O;ΔH=−227.3kJThe heat of formation of H2SO4 will be:

A
754.4kJ
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B
+320.5kJ
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C
650.3kJ
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D
433.7kJ
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Solution

## The correct option is A −754.4kJSince, on adding all the 4 reaction given in question we will get a final reaction,S+2O2+H2→H2SO4 Which is basically the formation reaction of H2SO4Hence, the heat of formation of H2SO4 = sum of heat of reactions of all four reaction, i.e,ΔHf(H2SO4)=ΔH1+ΔH2+ΔH3+ΔH4=−298.2−98.7−130.2−227.3=−754.4KJ.hence, answer is option A.

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