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5 December, 05:21

How many grams are in 7.62 X 1017 molecules of oxygen?

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  1. 5 December, 05:27
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    The number of grams that are in 7.62 x10^17 molecules of oxygen is 4.064 x10^-5 grams

    calculation

    by use of Avogadro constant find number of moles in 7.62 x10^-17

    that is 1 mole = 6.02 x10^23 molecules

    ? = 7.62 x10 ^17 molecules

    cross multiply

    (1mole x 7.62 x10^17) / 6.02 x10^ 23 = 1.27 x10^-6 moles

    mass = mole x molar mass

    molar mass of oxygen molecule = 16 x2=32g/mol

    mass = 11.27 x10^-6 moles x 32 g/mol = 4.064 x10^-5 grams
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