When `1.0g` of oxalic acid `(H_(2)C_(2)O_(4))` is burnt 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` isA. `-245.7 kJ//mol`B. `-2.43.45 kJ//mol`C. `-246.95 kJ//mol`D. `-241.95 kJ//mol`

When `1.0g` of oxalic acid `(H_(2)C_(2)O_(4))` is burnt in a bomb calo

1.	When `1.0g` of oxalic acid `(H_(2)C_(2)O_(4))` is burnt 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` isA. `-245.7 kJ//mol`B. `-2.43.45 kJ//mol`C. `-246.95 kJ//mol`D. `-241.95 kJ//mol`
Answer» Correct Answer - D `H_(2)C_(2)O_(4)(l)+(1)/(2)O_(2)(g) rarr H_(2)O(l) + 2CO_(2)(g)`, `Delta n_(g) = 3//2, Delta U_(c) = -(0.312 xx 8.75)/(1) xx 90` `= -245.7 kJ//mol`, `Delta H = Delta U + Delta n_(g)RT` `= -245.7+(3)/(2) xx (8.314 xx 300)/(1000) = -241.95 KJ//mol`

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When `1.0g` of oxalic acid `(H_(2)C_(2)O_(4))` is burnt 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` isA. `-245.7 kJ//mol`B. `-2.43.45 kJ//mol`C. `-246.95 kJ//mol`D. `-241.95 kJ//mol`

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