Molar mass of magnesium oxide (MgO)

The molar mass of magnesium oxide (MgO) is 40.304 g/mol.

Step-by-step calculation

ElementAtomsAtomic massSubtotal
Magnesium × 1 24.305 = 24.305
Oxygen × 1 15.999 = 15.999
Total40.304 g/mol

Percent composition by element

  • Magnesium 60.3%
  • Oxygen 39.7%

Magnesium oxide facts

  • Magnesium oxide is a white, odorless powder that forms when magnesium metal burns in air with a brilliant white flame.
  • It is used as an antacid, a laxative, a magnesium supplement, and a heat-resistant lining for furnaces.
  • It melts at about 2,800 °C, one of the highest melting points of any common compound, which makes it a valuable refractory material.

Try another formula

H2O NaCl CO2 C6H12O6 H2SO4 Ca(OH)2 CuSO4·5H2O C8H10N4O2

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Related compounds

MgSO4 Magnesium sulfate Mg(OH)2 Magnesium hydroxide MgCO3 Magnesium carbonate MgSO4·7H2O Magnesium sulfate heptahydrate CaMg(CO3)2 Dolomite Mg(NO3)2 Magnesium nitrate

FAQ

What is the molar mass of MgO?

The molar mass of magnesium oxide (MgO) is 40.304 g/mol.

How do you calculate the molar mass of MgO?

Multiply the atomic mass of each element by the number of its atoms in MgO, then add the results: 1 × 24.305 (Mg) + 1 × 15.999 (O) = 40.304 g/mol.

What percentage of MgO is Magnesium?

Magnesium makes up 60.3% of the mass of magnesium oxide (MgO).