A 21.8 g sample of water contains how many water molecules?

Name: A 21.8 g sample of water contains how many water molecules?
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Quizplus · Accepted Answer

The molar mass of water (H₂O) is approximately 18 g/mol. Therefore, 21.8 g of water is 21.8/18 = 1.21 moles. Since one mole of any substance contains Avogadro's number of molecules (6.02 x 10²³), 1.21 moles of water contains 1.21 x 6.02 x 10²³ = 7.29 x 10²³ molecules.

A 218 G Sample of Water Contains How Many Water Molecules