How many atoms are there in 0.9g of water (H2O?)

Molecular mass of H2O = 18g/mol
Number of molecules present in 18g of H2O = 6.022×1023 molecules

Number of molecules present in 0.9g of H2O = 6.022×102318×0.9 molecules

Number of atoms in 1 molecule = 3 (2 hydrogen and 1 oxygen)

Number of atoms in ​ 6.022×102318×0.9 molecules or 0.9g of H2O = ​ 6.022×102318×0.9×3 = 9.03×1022 atoms

The detailed study of calculation of number of atoms through mole concept is in 11th grade.

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