If 4.8 g of copper (II) oxide are used , how many moles of copper metal will be produced

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

Asolid that forms and separates from a liquid mixture is called

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?