Assuming no heat loss to the environment, calculate the Energy in calories done on a ballon as it expands from 1.0 L to 10.0 L at a constant external pressure of 720 torr. Note; 1 atm-L = 101.3 Joule.

Calculate the energy change of a ballon if it is compressed from 2.00L to 0.0200L at a constant external pressure of 1.00 atm and releases 08.5J of heat to the environment.

Calculate the energy change of a 30.1 g piece of iron if it is cooled from 400. ^{o}C to 25 ^{o}C? The specific heat capacity of iron is 0.4513 J/g^{o}C.

What is the specific heat capacity of an unknown metal object if a 69.07 g piece at 100. ^{.o}C is cooled to an equilibrium temperature of 23.0 ^{o}C after it is dropped into 100 ml of water at 20.0 ^{o}C.