How many molecules are in 3.50 moles of h2o

2.11 x 10²⁴ molecules.

Explanation:

Using cross multiplication:

1.0 mole of H₂O contains → 6.022 x 10²³ molecules.

3.5 mole of H₂O contains → ??? molecules.

∴ 3.5 mole of H₂O contain = (3.5 mol)(6.022 x 10²³) = 2.11 x 10²⁴ molecules.

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3 1/4 %

explanation: