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16 May, 12:18

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.

What is the mass of 2.20 * 1022 molecules of NaOH (Molar mass = 40.0 g/mol) ?

Express the mass in grams to three significant figures.

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  1. 16 May, 12:20
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    No' of molecules divide by avogadro number, 6*6.023*10^23 so (2.2*10^22) : (6.023*10^23)

    = 0.03653 moles

    moles * Molar mass = mass

    n*Mr=m

    0.03653*40 = 1.46 grams
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