4al + 3o2 > 2al2o3

the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 must react to form 3.80 mol of al2o3?

a.) 60.8
b.) 81.1
c.) 122
d.) 182

Molar mass of O2 = 32 g/mol

Mass of O2 = ?

4 Al + 3 O2 > 2 Al2O3

3 mol O2 > 2 mol Al2O3
x mol O2 > 3.80 mol Al2O3

2 x = 3.80 * 3

2 x = 11.4

x = 11.4 / 2

x = 5.7 moles of O2

1 mol O2 32 g
5.7 moles y

y = 5.7 * 32

y = 182

answer D

hope this helps!.

Talc (french chalk) is the ingredient