chemistry 111

Question

A 10.5 g sample of benzeme (c6h6) was combusted in a bomb calorimeter. If the temperature rose by 27.5 celcius, use the imformation below to determine the heat capacity of the calorimeter:

4 C6H6(l) + 31 O2(g) > 24 CO2(g) + 14 h2o (g)

delta Hrxn = -3.9099*10^3 kJ

 

Answer 1

10.5 g C6H6 x 1 mol/78 g = 0.1346 moles C6H6

0.1346 moles x 3.9099x103 kJ/4 moles = 526 kJ

q = C∆T C = q/∆T = 526 kJ/27.5ºC C = 19.1 kJ/ºC