Question

2.08g of metal Y react with 0.96g of oxygen to form a metal oxide.The empirical formula of the metal oxide is Y2O3.What is the relative atomic mass of metal Y.

Answer 1

.96g of O2 is .03 moles
So, since it takes 2 moles of Y to combine with 3 moles of O, and we have .03 moles of O2 (.06 moles of O), we have .04 moles of Y.

So, the molar mass of Y is 2.08/.04 = 52

Answer 2

Thanks a lot^^