How many molecules of h2o are equal to 97.2 g h2o

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Gia Perkins

Chemistry

9 September, 00:26

How many molecules of h2o are equal to 97.2 g h2o

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Gustavo Parsons · Answer 1

M (H₂O) = 97,2 g.

n (H₂O) = m (H₂O) : M (H₂O).

n (H₂O) = 97,2 g : 18 g/mol.

n (H₂O) = 5,4 mol.

N (H₂O) = n (H₂O) · Na.

N (H₂O) = 5,4 mol · 6,023·10²³ 1/mol.

N (H₂O) = 3,25·10²⁴ molecules of water.

n - amount of substance.

Na - Avogadro number.