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Explanation:The average mass of one H2O molecule is 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 molar mass of water is 18.02 g/mol.
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1 mole H2O = 18.016 grams, or .018016 kg. ---- To find the mass of 1 molecule of water it is just the Molar mass of the molecule divided by Avogadro's constant. The molar mass of water is 18.01528 gmol-1 Avogadro's constant is 6.0221415 × 1023 So the mass of one molecule is: 18.01528 gmol-1 ÷ 6.0221415 × 1023 = 2.991507 × 10-23g (7 significant figures)
Which is 2.991507 × 10-26kg or: 0.00000000000000000000000002991507kg
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