Molar and molecular weight of K2Cr2O7

• Molecular formula: K2Cr2O7 or Cr2K2O7
• Relative molecular weight of K2Cr2O7: 294.1846
• Molar mass of K2Cr2O7: 294.1846 g/mol (0.29418 kg/mol)

Calculation of the relative molecular and molar mass of K2Cr2O7

• Mr[K2Cr2O7] = Ar[Cr] * 2 + Ar[K] * 2 + Ar[O] * 7 = 51.9961 * 2 + 39.0983 * 2 + 15.9994 * 7 = 294.1846
• Molar mass (kg/mol) = Mr[K2Cr2O7] : 1000 = 294.1846 : 1000 = 0.29418 kg/mol

K2Cr2O7: percent composition by element

• Chromium (Cr) = 103.9922 : 294.1846 * 100 = 35.349 %
• Potassium (K) = 78.1966 : 294.1846 * 100 = 26.581 %
• Oxygen (O) = 111.9958 : 294.1846 * 100 = 38.07 %

Molar mass calculator