7molar mass chemistry question please help

Magnesium sulfide___gmm

3.Iron(3) Phosphate____gmm


4.Copper (1) Sulfate_______gmm


5.Barium Nitrate_____gmm


6.Lithium Phosphate_____gmm

7.Nitrogen Triflouride___gmm


8.Sulfur hexachloride____gmm


9.carbon Tetrachloride____gmm

1. you only need a periodic table to determine the molar mass of these compounds
2. it isn't 1 and 3, it's I and III, roman numerals
3. you don't know how to write these compounds, do you?

9. CCl4 = 12 + 4(35.45) = 153.8g/mole