1 How many grams are needed to prepare 4.52 moles of mg

2 How many moles of NaCl are in 120 grams.
3 What is the molar mass of Magnesium fluoride.

Molar mass of Mg = 24.3 g/mol.
4.52 mol Mg x (24.3 g / 1 mol) = 109.8 g

Molar mass of NaCl = 58.5 g/mol
120. g x (1 mol / 58.5 g) = 2.05 mol NaCl

Molar mass of MgF2 = (24.3 + (2 x 19.0)) = 62.3 g/mol

You need to understand the wealth of information that is on the Periodic Table. For instance, you will find the atomic mass of Mg, and that tells you how many grams in one mole.

And you will also find the atomic masses of sodium and chlorine, and you add both of them together, and you will then know how many grams in one mole.

And the same approach with MgF.

And no, if I gave you those values, you wouldn't learn anything.