Which has a greater volume, 100mL of alcohol or 100mL of water? Prove your answer.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

The molar mass of nickel(ni) is 58.7 g/mol. how many moles are in an 88 gram sample of nickel?