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Question

When 1.0 g of oxalic acid (H2C2O4) is burned in a bomb calorimeter whose heat capacity is 8.75 kJ/K, the temperature increases by 0.312 K. The enthalpy of combustion of oxalic acid at 27 C is:

A
345.7 kJ/mol
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B
544.452 kJ/mol
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C
241.95 kJ/mol
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D
None of these
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Solution

The correct option is C 241.95 kJ/mol
The balanced chemical equation for the reaction is:
H2C2O4(s)+12O2(g)H2O(l)+2CO2(g);Δng=212=32ΔUc=0.312×8.751×90=245.7 kJ/molWe know,ΔH=ΔU+ΔngRT=245.7+32×8.314×3001000=241.95 kJ/mol

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