These questions are on gas laws.

If I had 25.0 grams of methane, how many moles of CH4 would I have?

If I had the above moles of methane in a sealed 1.55 Liter container at 25C, what would be the pressure in the container in the atmosphere?

.If I cooled down the same number of moles in the same container to 12C what would be the pressure in the atmosphere?

Did the pressure in the container increase or decrease? Explain why it happened.