Answer to Question #278347 in Physical Chemistry for chrstn

Question

A 2.50-g of sucrose (C₁₂H₂₂O₁₁) was burned with excess oxygen in a calorimeter which contained 1.95 kg of water. The temperature of the calorimeter and contents increased from 18.22^◦C to 22.73^◦C. The calorimeter had a water equivalent of 240 g. Determine the heat of combustion of sucrose in kcal/mole.

 C₁₂H₂₂O₁₁(s) + 12 O₂(g)  --------------> 12 CO₂ (g) + 11 H₂O (l)

Answer 1

Heat of combustion of sucrose in kcal/mole

=-3068