Answered

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

Verified Answer :

Willchemistry

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!.

thepointe3

Answer:

D. 182

Explanation:

It is correct on edge

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