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10 March, 03:18

How many molecules are there in 840 grams of na2SO4

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  1. 10 March, 06:39
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    3.56x10^24 molecules

    Explanation:

    The following data were obtained from the question:

    Mass of Na2SO4 = 840g

    Molar Mass of Na2SO4 = (23 x2) + 32 + (16x4) = 46 + 12 + 64 = 142g/mol

    From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 molecules. This also gives that 1mole of Na2SO4 contains 6.02x10^23 molecules.

    If 1 mole (i. e 142g) contains 6.02x10^23 molecules,

    Therefore, 840g of Na2SO4 will contain = (840 x 6.02x10^23) / 142 = 3.56x10^24 molecules
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