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15 June, 11:16

How many moles (of molecules or formula units) are in each sample? 79.34 g cf2cl2?

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  1. 15 June, 13:55
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    From the periodic table:

    molecular mass of carbon = 12 grams

    molecular mass of fluorine = 18.99 grams

    molecular mass of chlorine = 35.5 grams

    Therefore:

    one mole of CF2Cl2 = 12 + 2 (18.99) + 2 (35.5) = 120.98 grams

    Therefore, we can use cross multiplication to find the number of moles in 79.34 grams as follows:

    mass = (79.34 x 1) / 120.98 = 0.6558 moles

    Now, one mole contains 6.022 x 10^23 molecules, therefore:

    number of molecules in 0.65548 moles = 0.6558 x 6.022 x 10^23

    = 3.949 x 10^23 molecules
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