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24 September, 11:57

Find the mass in grams of 1.00 x 10^23 molecules of N2

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  1. 24 September, 12:04
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    the mass in grams of 1.00 x 10^23 molecules of N2 is 4.648 g

    calculation

    Step 1: use the Avogadro's constant to determine the moles of N2

    According to Avogadro's law 1 mole = 6.02 x 10 ^23 molecules

    ? moles = 1.00 x 10 ^23 molecules

    by cross multiplication

    = (1 mole x 1.00 x10^23 molecules) / (6.02 x 10^23 molecules)

    =0.166 moles of N2

    Step 2 : find mass of N2

    Mass = moles x molar mass

    From periodic table the molar mass of N2 = 14 x2 = 28 g/mol

    mass = 0.166 moles x 28 g/mol = 4.648 g
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