If 2 g of element X combines with 7 g of element Y to form compound XY, how many grams of Y are needed to form compound XY2?

(1 Point)

14g of Y to form the compound XY₂

Explanation:

In the compound XY, you have 1 mole of X and 1 mole of Y. Thus, you can imagine the molar mass of X is 2g/mol and molar mass of Y is 7g/mol.

Now, in the compound XY₂, you have 1 mole of X but 2 moles of Y.

If you have 2g of X, in this case you will need:

2 moles Y * (7g / mol) =

14g of Y to form the compound XY₂