I am studying for a big exam I have next week, and we have a study guide that we can do. But, I've been stuck on this for a while, I think I got the first two. If anyone could help please.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?

If a solution contains 3 moles/liter of sodium chloride (nacl, made of sodium ions and chloride ions), what is the osmolarity of this solution