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Question

Calculate ΔHof of C6H12O6(s) from the following data:
ΔHcomb. of C6H12O6(s)=2816 kJ mol1 , ΔHof of CO2(g)=393.5 J mol1 and ΔHof(H2O) =285.9 kJ mol1.

A
1260 kJ mol1
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B
1260 kJ mol1
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C
2260 kJ mol1
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D
3260 kJ mol1
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Solution

The correct option is B 1260 kJ mol1
heat of formation of C6H12O6= 6 × formation of CO2 + 6 × formation of H2O - heat of combustion of C6H12O6
heat of formation of C6H12O6 = 6(393.5)+6(285.9)(2816)
heat of formation of C6H12O6= 1260KJmol1

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