Assume you had a 15 L tank containing the gas CH4 at a temperature of 20 °C.
For each of the following changes, indicate whether the gas pressure inside the
tank will increase, decrease, or not change
A) the volume of the tank was reduced from 15L to 10L

B) the original gas in the tank, CH4 was replaced with the gas C3H8

C) the temperature was reduced to 15 degrees celsius

D) helium was added to the tank