Asample of gas in a 3.0 l container has a pressure of 4.0 atm. if this container is connected to a 5.0 l container and the gas is allowed to enter this container as well, what will be the final pressure of this gas if the temperature remains constant?

Plss anybody know how to do this? ? i need the answers from a through d

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.