ThermochemistryHard
Question
When 1.0 g of oxalic acid 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 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 =
ᐃu =
= -245.7 kJ/mol
ᐃH = ᐃu + ᐃngRT
= - 245.7 +
= - 246.947 kJ/mol
O2(g) → H2O(l) + 2CO2(g)ᐃng =
ᐃu =
= -245.7 kJ/molᐃH = ᐃu + ᐃngRT
= - 245.7 +
= - 246.947 kJ/mol
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