Calculate the relative molecular weights of the substances: NaCL, MgSO4, KOH.
August 24, 2021
In order to calculate the relative molecular weights of substances, you need to sum up the atomic masses of each from the atoms, taking into account the indices. Atomic masses can be viewed in the periodic table of DI Mendeleev.
M (NaCL) = Ar (Na) + Ar (Cl);
M (NaCL) = 23 + 35.5 = 58.5 g / mol.
M (MgSO4) = Ar (Mg) + Ar (S) + 4Ar (O);
M (MgSO4) = 24 + 32 + 4 * 16 = 120 g / mol.
M (KOH) = Ar (K) + Ar (O) + Ar (H);
M (KOH) = 39 + 16 + 1 = 56 g / mol.
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