The combustion of magnesium weighing 4.8 g resulted in the formation of an oxide

The combustion of magnesium weighing 4.8 g resulted in the formation of an oxide weighing 8.0 g. Determine the equivalent mass of magnesium.

1) Find the equivalent mass of oxygen by the formula:

E of an element = relative atomic mass of an element: the valence of an element.

E (O) = 16: 2 = 8.

2) Let’s calculate how much oxygen went into the oxidation of magnesium:

8 – 4.8 = 3.2 (d).

3) Find the equivalent mass of magnesium:

knowing that chemical elements are combined in ratios equal to their equivalents, we will compose the proportion:

if the oxidation of 4.8 (g) of magnesium went to 3.2 (g) of oxygen,

then 8 will go to x (in the case of combining the equivalent masses of these elements).

x = 4.8 * 8: 3.2 = 12.