What is the percent composition of magnesium (Mg) in MgO?A.50%B.40%C.60%D.70%SUBMITarrow_backPREVIOUS
Question
What is the percent composition of magnesium (Mg) in MgO?A.50%B.40%C.60%D.70%SUBMITarrow_backPREVIOUS
Solution
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%
- The molar mass of magnesium (Mg) is approximately 24.31 g/mol.
- The molar mass of oxygen (O) is approximately 16.00 g/mol.
- 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%.
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