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14 September, 11:34

What is the formula weight (molar mass) of a compound if 20 g of the compound in 500 mL of solution gives a 0.5 M solution?

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  1. 14 September, 15:11
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    The molar mass of a compound is calculated as below

    find the number of moles

    moles = molarity x volume/1000

    =500 ml x0.5 / 1000 = 0.25 moles

    molar mass is therefore = mass/number of moles

    = 20/0.25 = 80 g/mol
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