What is the percent composition of magnesium (Mg) in MgO?A.50%B.40%C.60%D.70%SUBMITarrow_backPREVIOUS

To find the percent composition of magnesium in MgO, you need to know the molar mass of both magnesium and oxygen, and then use the following formula:

Percent composition = (part/whole) x 100%

1. The molar mass of magnesium (Mg) is approximately 24.31 g/mol.
2. The molar mass of oxygen (O) is approximately 16.00 g/mol.
3. The molar mass of magnesium oxide (MgO) is the sum of the molar mass of Mg and O, which is 24.31 g/mol + 16.00 g/mol = 40.31 g/mol.

Now, you can find the percent composition of Mg in MgO:

Percent composition of Mg = (24.31 g/mol / 40.31 g/mol) x 100% = 60.3%

So, the closest answer would be C. 60%.