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15 June, 17:55

If 26.2 grams of a pure compound contain 8.77 * 1022 molecules, what is the molecular weight of this compound? Answer in units of g/mol.

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  1. 15 June, 18:15
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    Mw = 179.845 g/mol

    Explanation:

    Mw [=] g/mol

    ∴ w = 26.2 g

    ∴ 1 mol = 6.02 E23 molecules ... Avogadro's number

    ⇒N° moles = 8.77 E22 molecules * (mol / 6.02 E23 molecules) = 0.146 mol

    ⇒ Mw = 26.2 g / 0.146 mol = 179.845 g/mol
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