First, you have to refer back to your table of elements.
Break it down. When they say how many grams, it means the atomic weight. In this case, we have a chemical compound.
MgCl2 mass:
Mg= 24.305
Cl2= 35.453 x 2= 70.906
Mg + Cl2= 24.305 + 70.906 = 95.211
So, one mole of MgCl2 is 95.211 grams.
To get what you are looking for, multiply this by 6...
95.211 x 6 =…
I made it pretty simple for you, all you have to do is multiply.
Hope I helped!
~