Chemistry, How many particles? Mole Lab.?

[Mia S]

Chemistry is really confusing and I need some help. Explaining would help a lot. Help if you can. Thanks.

Mass of cup and water before drinking: 149.83 g
Mass of cup and water after drinking: 120.69 g
Mass of water swallowed: 29.14 g

Questions

1. Molar Mass of water?
___ g
2. Moles of water shallowed?
___ mol
3. Number of molecules of water shallowed?
___ mole

Part 2

Mass of chalk before writing: 5.45 g
Mass of chalk after writing: 5.41 g
Mass of chalk used to write your name: .04 g

Questions

4. Molar Mass of chalk (CaCO3)
___ g
5. Moles of chalk used?
___ mol
6. Formula units of chalk used?
___ form un

Please help if you understand this. Thanks! =]