CO2 is stored in a 3.0 L water capacity cylinder at a 126 kg/cm2g working pressure at ambient temperature say 25 °C. What will be the pressure of the compressed CO2 gas if the temperature of the cylinder rises to 80 °C? A radiator made out of iron has a mass of 45.0 kg. It is filled with 23.0 kg of water. What is the heat capacity of the water-filled radiator? How long will it take for the temperature to increase by 20 °C if thermal energy is provided to the radiator at the rate of 450 W?