How do you convert grams to moles to molecules?
Using the basics of stoichiometry, you can use the formulae to apply to problems like this. (See explanation)
To convert grams to moles, you will need to molar mass of that specific element, molar mass is found my multiplying the number of atoms present in the compound by the relative atomic mass found on the bottom of the element block.
However, the formulae don't look like this, they have variables to represent each term.
Here are the formulae which you need and can rearrange to solve:
This is the fundamental of stoichiometry; perhaps you should consider watch a few videos explaining it if you haven't seen this before.