How man atoms of Mg are in the following equation:
(Mg3 N2)4

Explanation:

We are given this formula:

We want to find the number of magnesium atoms. We can see that there is a subscript of 3 after the magnesium, so there are 3 magnesium atoms in 1 molecule of the compound.

However, there is a subscript of 4 that comes after the entire compound, so there are actually 4 molecules, with each molecule containing 3 magnesium atoms. Multiply 4 and 3.

There are 12 magnesium atoms.

if you're asking what comes out, it's steam.

diaria maybe go see a doctor about that