A compound contain 10 atoms of nitrogen. find the molecular mass of the compound if 2.8% offer nitogen is present by mass?
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The average mass of one H2O molecule is 10 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 2.8 grams. This is stated: the molar mass of water is 2.8 g/mol.
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