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9 March, 11:45

A chemist determines by measurements that 0.030 moles of nitrogen gas participate in a chemical reaction. calculate the mass of nitrogen gas that participates.

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  1. 9 March, 11:54
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    Remember that:

    number of moles = mass/molar mass

    First, we get the molar mass of the nitrogen gas molecule:

    It is known the the nitrogen gas is composed of two nitrogen atoms, each with molar mass 14 gm (from the periodic table)

    Therefore, molar mass of nitrogen gas = 14 x 2 = 28 gm

    Second we calculate the mass of the precipitate:

    we have number of moles = 0.03 moles (given)

    and molar mass = 28 gm (calculated)

    Using the equation mentioned before,

    mass = number of moles x molar mass = 0.03 x 28 = 0.84 gm
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