Please help me... (I'm sick at home, so my teacher wasn't able to teach me this... Also please do not just give a random answer, please answer it correctly)

Nonpoint source pollution is difficult to control because it

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?