What is the mass of 8.1g of zinc oxide?

To find the mass of zinc in 8.1g of zinc oxide, you need to consider the atomic masses of zinc (Zn) and oxygen (O). The molar mass of ZnO is 81.38 g/mol. Since zinc accounts for 65.38% of the molar mass, the mass of zinc in 8.1g of ZnO is 8.1g * (0.6538) ≈ 5.3g.