A sealed container holding 0.500 kg of liquid nitrogen at its boiling point of 77.3 K is placed in a large room of 21.0 °C. Energy is transferred from the room to the nitrogen as the liquid nitrogen boils into a gas and then warms to room temperature.
a. Assuming the room's temperature remains essentially unchanged at 21.0 °C, calculate the energy transferred from the room to the nitrogen.
b. Estimate the change in entropy of the room.
Liquid nitrogen has a latent heat of vaporization of . The specific heat of gas at constant pressure is .
