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Question

Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

Solution
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1.4 g of nitrogen corresponds to 1.428=0.05 moles.
0.05 moles of nitrogen corresponds to 0.05×6.023×1023=3.011×1022 molecules.
One molecule of nitrogen contains 14 electrons.
1.4 g of nitrogen will contain 3.011×1022×14=4.2154×1023 electrons.

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