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

When 1.0g of oxalic acid (H_(2)C_(2)O_(4)) is burned in a bomb calorim

1.	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
Answer» `-245.7` kJ/mol 249.4kJ/mol `-241.9`kJ/mol `-57.87` k Cal `mol^(-1)` Solution :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