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When 1.0g of oxalic acid (H(2)C(2)O(4)) ...

When 1.0g of oxalic acid `(H_(2)C_(2)O_(4))` is burned in a bomb calorimeter whose heat capacity is 8.75kJ/K, the temperature increases by 0.312K. The enthalpy of combustion of oxalic acid at `27^(@)C`

A

`-245.7` kJ/mol

B

249.4 kJ/mol

C

`-241.9` kJ/mol

D

`-57.87` k Cal `mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C, D
In Bomb calorimeter we can calculate `Delta U` which is equal to Q. `Q = Delta U = - ms Delta T = - 8.75 xx 0.312 = - 2.73//gr`
`Delta u`/mole `= -2.73 xx 90 = 245.7`KJ
`Delta H = Delta U = Delta n RT`
Reaction for combustion of oxalic acid is
`H_(2)C_(2)O_(4(s)) + (1)/(2) O_(2(g)) rarr 2CO_(2(g)) + H_(2)O_((l))`
So, `Delta n = (3)/(2)`
`Delta H= - 245.7 + (3)/(2) xx 8.314 xx 10^(-3) xx 300`
= -241.9587
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