How many atoms are there in 65.8g H2O?

2,198,081,377,400,000,000,000,000 atoms

Explanation:

Avogadro's number = 6.02214076 ×

One mole of any element, including atoms, is  Avogadro's number of them.

H2O = 18g/mol

Mass  →  Moles  and  Moles  →  Atoms

65.8g/18g/mol = 3.65 moles of H2O

3.65 moles x 6.02214076 × = 2,198,081,377,400,000,000,000,000 atoms

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