Question

A 4.1-g sample of Colorado oil shale is burned in a bomb calorimeter, which causes the temperature of the calorimeter to increase by 5.0 °C. The calorimeter contains 1.00 kg of water (specific heat of water 4.184 J/g°C) and the heat capacity of the empty calorimeter is 0.10 kJ/°C. How much heat is released per gram of oil shale when it is burned? 21 kJ/g 0 kJ/g 0.19 kJ/g 42 kJ/g 5.2 kJ/g

Answer 1

Q = mc?T

Q = heat energy (Joules, J), m = mass of a substance (kg)

c = specific heat (units J/kg?K), ? is a symbol meaning "the change in"

?T = change in temperature (Kelvins, K)

Total heat = heat gained by water + Heat gained by calorimeter

heat gained by water = 1000 x 4.184 x 5 = 20920 Joules

Heat gained by calorimeter = 5 x 0.1 x 10³ = 500 Joules

Total heat = 20920 + 500 = 21420 Joules or 21.4 Kilo Joules

A 4.1-g sample of Colorado oil shale is burned in a bomb calorimeter, which causes the temperature of the calorimeter to increase by 5.0 °C. The calorimeter contains 1.00 kg of water (specific heat of water 4.184 J/g°C) and the heat capacity of the empty calorimeter is 0.10 kJ/°C. How much heat is released per gram of oil shale when it is burned? 21 kJ/g 0 kJ/g 0.19 kJ/g 42 kJ/g 5.2 kJ/g