Determine the molar mass of SeO3, K2O

The molar mass of a substance is numerically equal to the relative molecular mass, which is the sum of the relative atomic masses, taking into account the number of atoms in the molecule.

M (SeO3) = Ar (Se) + 3 Ar (O) = 79 + 3 × 16 = 127 g / mol.

M (K2O) = 2 Ar (K) + Ar (O) = 2 × 39 + 16 = 94 g / mol.

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