Question

A)

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.429-g sample of benzil (C14H10O2) in a bomb calorimeter containing 1100. g of water. The temperature increases from 24.80 °C to 27.30 °C. The heat capacity of water is 4.184 J g-1°C-1. The molar heat of combustion is −6784 kJ per mole of benzil. C14H10O2(s) + 31/2 O2(g) --> 14 CO2(g) + 5 H2O(l) + Energy Calculate the heat capacity of the calorimeter. heat capacity of calorimeter = ___J/°C B)

A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. In an experiment, a 0.4001 g sample of benzil (C14H10O2) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.202×103 g of water. During the combustion the temperature increases from 24.99 to 27.24 °C. The heat capacity of water is 4.184 J g-1°C-1. The heat capacity of the calorimeter was determined in a previous experiment to be 910.1 J/°C. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of benzil based on these data. C14H10O2(s) + (31/2) O2(g) --> 5 H2O(l) + 14 CO2(g) + Energy Molar Heat of Combustion = ___kJ/mol C) A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.366-g sample of phenanthrene (C14H10) in a bomb calorimeter containing 1070. g of water. The temperature increases from 25.30 °C to 28.00 °C. The heat capacity of water is 4.184 J g-1°C-1. The molar heat of combustion is −7054 kJ per mole of phenanthrene. C14H10(s) + 33/2 O2(g) --> 14 CO2(g) + 5 H2O(l) + Energy Calculate the heat capacity of the calorimeter. heat capacity of calorimeter = ____J/°C

Answer 1