Free points ig have a nice day

Evaluate this exponential expression,8. (2 + 3)2 – 42

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

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?