If 18 grams of Ca combines with 22 grams of S to form a compound with a mass of 40 grams, what will be the percent composition of S in the
compound?

How is the atomic number of a nucleus changed by alpha decay

The fact that the total amount of energy in a system remains constant is a(n)

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?