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    				| 1. | calculate the formula unit masses of Na2O. given atomic masses is Na=23u | 
| Answer» Formula unit mass: The formula unit mass of a substance is the sum of the atomic masses of all atoms in a formula unit of a compound. The term ‘formula unit’ is used for those substances which are made up of ions.Formula unit mass of Na2O = 2 × 23 +16 =46 + 16 =62u | |