Question

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C . The molar mass of sugar is 342.3 g/mol.

Answer 1

q = [mass H2O x specific heat H2O x (Tfinal-Tinitial)] + [Ccal x 4.90]
That gives q for 3.50g sucrose.
(q/3.5) x (mol mass sucrose/1 mol) = q/mol = delta Erxn

Answer 2

2.35 x 104 kj/mol

Answer 3

1960 j

Answer 4

- 1.92 x 10^3 kJ/mole