When 1.0 g of oxalic acid `(H_(2)C_(2)O_(4))` is burnt in a bomb calorimeter whose capacity is 8.75 KJ/K, the enthalpy of combustion of oxalic acid at`27^(@)C` is :A. `-245.7 KJ//mol`B. `-244.452 KJ//mol`C. `-246.947 KJ//mol`D. None of these

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

1.	When 1.0 g of oxalic acid `(H_(2)C_(2)O_(4))` is burnt in a bomb calorimeter whose capacity is 8.75 KJ/K, the enthalpy of combustion of oxalic acid at`27^(@)C` is :A. `-245.7 KJ//mol`B. `-244.452 KJ//mol`C. `-246.947 KJ//mol`D. None of these
Answer» Correct Answer - C `H_(2)C_(2)O(l) + (1)/(2)O_(2)(g) rarr H_(2)O(l) + 2O_(2)(g),` `Deltan_(g)=3//2` `DeltaU_(0) =-(0.312 xx8.75)/(1) xx 90 =-245.7 KJ//"mol"` `DeltaH=DeltaU+ Deltan_(g)RT =- 245.7 KJ//"mol"` `DeltaH=DeltaU + Deltan_(g)RT =-245.7 +(3)/(2) xx (8.314xx300)/(1000)=-241.947 KJ//"mol"`

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When 1.0 g of oxalic acid `(H_(2)C_(2)O_(4))` is burnt in a bomb calorimeter whose capacity is 8.75 KJ/K, the enthalpy of combustion of oxalic acid at`27^(@)C` is :A. `-245.7 KJ//mol`B. `-244.452 KJ//mol`C. `-246.947 KJ//mol`D. None of these

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