ThermochemistryHard

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 27oC is :

Options

A.-245.7 kJ/mol
B.-244.452 kJ/mol
C.-246.947 kJ/mol
D.None of these

Solution

H2C2O4(l) + O2(g) → H2O(l) + 2CO2(g);
ᐃng = 3/2
ᐃUc = - × 90
= - 245.7 kJ/mol
ᐃH = ᐃU + ᐃngRT
= - 245.7 + = - 246.947 kJ/mol

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