If 42.4g of Al react with excess O2 and 67.3g of Al2O3 are produced, what was the percent yield of

If 42.4g of Al react with excess O2 and 67.3g of Al2O3 are produced, what was the percent yield of Al2O3?

The Balanced Equation is 4 Al + 3 O2 –> 2 Al2O3