Calculate the relative molecular weights of substances: CaO Na2O H3PO4
| November 22, 2020 | education
In order to calculate the molecular weights of compounds, you need to add the atomic masses of all the elements included in it.
Mr (CaO) = 40 + 16 = 56 g / mol
Mr (Na2O) = 23 * 2 (since two sodium atoms) + 16 = 62 g / mol
Mr (H3PO4) = 1 * 3 + 31 + 16 * 4 = 98 g / mol
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