Anonymous
Anonymous asked in Science & MathematicsChemistry · 1 decade ago

This is a chemistry question please help with it!!!?

How many grams are in 5.00 X 10^24 molecules of lithium hydroxide? or LOH?

2 Answers

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  • Mahk
    Lv 5
    1 decade ago
    Favorite Answer

    To go from molecules to grams, divide by Avogadro's Constant (6.02*10^23) and then multiply that (which is moles) by the molar mass of LOH (7+16+1) = 24.

    5*10^24 / 6.02*10^23 = 8.3 mol

    8.3 mol * 24 g/mol = 199.3 g

    Hope this helps.

    Source(s): Biochem major
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  • .
    Lv 6
    1 decade ago

    You have to first convert the molecules into moles. To get from molecules to moles, divide by Avogdro's number, which is 6.02*10^23.

    So then:

    5.00 * 10^24 // 6.02*10^23 = 8.30564784 Moles

    As you will probably know, Mass (g) = Molar Mass (g/mol) * Moles

    So then:

    LiOH = 23.948g/mol

    I believe you meant LiOH, not LOH

    Grams = 8.30564784 Moles * 23.948g/mol

    Grams = 198.903654 g

    Grams = 199 g because of the 3 sig figs.

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