Need help with the middle question! Please hurry! What’s the answer to this?

Nonpoint source pollution is difficult to control because it

Determine the reaction and balance the following equations urgent due in the morning

What would be the original temperature of a gas that has a volume of 2.0 l and a pressure of 2.0 atm and an unknown temperature that the volume increased to 3.5 l in its pressure decreased to 1.0 atm if the final temperature is measured to be 11°c