A) A gaseous reaction occurs at a constant pressure of 50. atm and releases 74.2kj of heat. Before the reaction, the volume of the system was 8.00L After the reaction, the volume of the system was 2.80L

Calculate the total internal energy change in kilojoules.

B) gas is confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 6.60 to 3.30L When the external pressure is increased to 2.50atm the gas further compresses from 3.30 to 2.64atm.

In a separate experiment with the same initial conditions, a pressure of 2.50atm was applied to the gas, decreasing its volume from 6.60 to 2.64L in one step.

If the final temperature was the same for both processes, what is the difference between q for the two-step process and qq for the one-step process in joules?