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23 February, 03:22

A mothball, composed of naphthalene (C10H8), has a mass of 1.52g. How many naphthalene molecules does it contain?

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  1. 23 February, 03:44
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    The molar mass of naphthalene is calculated as follows,

    10 x (12.01 g / mol) + 8 x (1.01 g/mol) = 128.12 g/mol

    Divide the given mass by the molar mass to determine the number of moles of naphthalene present in the ball.

    n = 1.52 g / 128.12 g/mol = 0.01186 mole

    Multiply the number of moles to number of moles per mole.

    (0.01186 mol) x (6.022 x10^23 molecules / mole) = 7.14 x 10^21 molecules
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