Question

what has a mass equal to that of one mole of water​

Answer 1

Answer:

The average mass of one H2O moleculeis 18.02 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 18.02 grams. This is stated: the molarmass of water is 18.02 g/mol.

Answer 2

Chemical Computations with Avogadro's Number and the Mole

Another property of Avogadro's number is that the mass of one mole of a substance is equal to that substance's molecular weight. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.

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