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Question

# If S+O2→SO2 ; ΔH=−298.2 SO2+12O2→SO3 ; ΔH=−98.7 SO3+H2O→H2SO4 ; ΔH=−130.2 H2+12O2→H2O ; ΔH=−287.3Then the enthalpy of formation of H2SO4 at 298 K is

A
814.4kJ
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B
650.3kJ
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C
320.5kJ
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D
433.5kJ
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Solution

## The correct option is A −814.4kJThe thermochemical reactions are as given below.S+O2→SO2,ΔH=−298.2SO2+12O2→SO3,ΔH=−98.7SO3+H2O→H2SO4,ΔH=−130.2H2+12O2→H2O,ΔH=−287.3The four reactions are added to obtain the reaction S+H2+2O2→H2SO4. This is the reaction for the formation of H2SO4.Hence, the enthalpy of formation of H2SO4 is −298.2−98.7−130.2−287.3=−814.4kJ

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