20. Heat and Temperature

How much heat must be removed from 0.7 kg of water at 23°C to cool it to 0°C and completely freeze it?

A 5.0 g ice cube at −20°C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 200°C? Steam has c_V = 1500 J/kg K and c_P = 1960 J/kg K.

High-altitude mountain climbers do not eat snow, but always melt it first with a stove. To see why, calculate the energy absorbed from your body if you melt 1.0 kg of -15°C snow using a stove and drink the resulting 1.0 kg of water at 2°C, which your body has to warm to 37°C.

An iron boiler of mass 180 kg contains 710 kg of water at 18°C. A heater supplies energy at the rate of 58,000 kJ/h. How long does it take for the water to all have changed to steam?

Calculate what will happen when 1000 J of heat is added to 100 grams of water at 10°C.