Question

Given the balanced equation, calculate the mass of product that can be prepared from 2.40 g of zinc metal.
2Zn(s)+O2(g)→2ZnO(s)

Answer 1

Molar mass :

Zn = 65.38 g/mol
ZnO = 81.37 g/mol

2 Zn + O₂ = 2 ZnO

2 x 65.38 g Zn -------------- 2 x  81.37 g ZnO
2.40 g Zn -------------------- ??

2.40 x 2 x 81.37 / 2 x 65.38 =

390.576 / 130.76 => 2.986 g of ZnO