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Question

Given
S(s)+O2(g)SO2(g);ΔH=298.2kJ
SO2(g)+12O2(g)SO3(g);ΔH=98.7kJ
SO3(g)+H2O(l)H2SO4(l);ΔH=130.2kJ
H2(g)+12O2(g)H2O(l);ΔH=287.3kJ
The enthalpy of formation of H2SO4 will be :

A
814.4kJ
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B
+320.5kJ
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C
650.3kJ
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D
933.7kJ
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Solution

The correct option is A 814.4kJ
The required thermochemical equation,
S(s)+H2(g)+2O2(g)H2SO4() can be written by using (iv)+eqn(i)+eqn(ii)+eqn(iii)
Hence, ΔH=287.3+(298.2)+(98.7)+(130.2)
=814.4kJ

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