Answer to Question #144840 in General Chemistry for Martana Eldridge

Question

How many grams of oxygen gas must react to give 2.90 g of ZnO?
2Zn(s)+O2(g)→2ZnO(s)
Express your answer with the appropriate units.

Answer 1

Molar mass of oxygen=16

Molar mass of ZnO=81

Since there are two molecules of ZnO,it will be (81×2)=162

Therefore:

16g of O2 react to give 162g of ZnO

Amount of O2 that will react to give 2.9g of ZnO is :

16×2.9/162=0.286g