A gas sample has a volume of 4250 mL at 15 degree Celsius and 745 mmHg. What is the final temperature, in degree Celsius, after the sample is transferred to a different container with a volume of 2.50 L and a pressure of 1.20 atm if the amount of gas does not change?

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).