Question #57781

1 Answer
Dwight
Apr 26, 2017

3 moles of #O_2# are needed; 6 moles of MgO are produced.

Explanation:

The balanced equation is

#2Mg+O_2 rarr 2MgO#

We see that the ratio of Mg to #O_2# is 2:1

This means you need twice as many moles of magnesium as oxygen, or if you prefer, half as much oxygen as magnesium.

Either way, the 6 moles of Mg require 3 moles of #O_2# to react completely.

We will get 6 moles of #MgO#, as the ratio between Mg and MgO is 2:2 (or 1:1).

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