Molar and molecular weight of Cr2O7

• Relative molecular weight of Cr2O7: 215.988
• Molar mass of Cr2O7: 215.988 g/mol (0.21599 kg/mol)

Calculation of the relative molecular and molar mass of Cr2O7

• Mr[Cr2O7] = Ar[Cr] * 2 + Ar[O] * 7 = 51.9961 * 2 + 15.9994 * 7 = 215.988
• Molar mass (kg/mol) = Mr[Cr2O7] : 1000 = 215.988 : 1000 = 0.21599 kg/mol

Cr2O7: percent composition by element

• Chromium (Cr) = 103.9922 : 215.988 * 100 = 48.147 %
• Oxygen (O) = 111.9958 : 215.988 * 100 = 51.853 %

Molar mass calculator