Question

3.5 g of X reacts with a certain mass of Y to form a compound with 2 g of Y left over. 10.5 g of X reacts with a certain amount of Y to form the same compound of mass 42 g.

a. How much of Y combines with X to form the compound?
b. What is the chemical formula of the compound?

Answer 1

a. m(Y) = 42 - 10.5 = 31.5 g

b. The chemical formula XY3