1. The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you have after 15 years?
I
A: 1.25 g
B:58
C: 10 g
D: 20 g

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?