Question

How can i determine the mass of magnesium in a compound

Answer 1

To determine the mass of magnesium (Mg) in a given compound:

First determine the number of moles of Mg in a given compound.

Then multiply the number of moles of Mg with its atomic mass (since 1mole of any element is it's atomic mass)

Example: let's consider MgCO3 (Magnesium Carbonate).

In the MgCO3 there is 1 mole of Mg.

But 1 mole of Mg = 24.305 g (It's atomic mass).

Then 1 mole of Mg = 1×24.305 g of Mg.

= 24.305 g of Mg.

So the mass of Mg in MgCO3 is 24.305 g.

Note: Number of moles determined by number of atoms in the given compound.