Calculate molar mass (calculate molecular weight, Molar Mass Calculator).Formula:42MgO -- e-Tools Age

	Calculate molar mass
	Enter a chemical formula in the field below, pay attention to formula is case sensitive!!!	The formula should be entered as: H₂SO₄= H2SO4 CuSO₄.5H2O=CuSO4.5H2O 3BeO.Al2O₃.6SiO₂= (BeO)3.Al2O3.6SiO2

Calculations:
Formula: 42MgO
Molar Mass: 82.304 g/mol        1g=1.21500777604977E-02 mol
Percent composition (by mass):
Element  Count           Atom Mass                %(by mass)
Mg                2.7              24.305                        80.56%
O                  3.6              15.999                        70.47%

Top Use: Molar Mass Calculator Formula: Co2(Cr2O7)3 Recent user inquiry: 1/15/2026 02:09Molar Mass Calculator Formula: (Ch3)2N2H2 1/15/2026 02:09Molar Mass Calculator Formula: SnI2 1/15/2026 02:09Molar Mass Calculator Formula: NaC6H5CO2 1/15/2026 02:09Molar Mass Calculator Formula: NaOH3 1/15/2026 02:09Molar Mass Calculator Formula: 2C6H14