Question
Wed March 26, 2014 By: Sidharth V

Calculate the total number of electrons present  in 14g of dinitrogen. 

Expert Reply
Thu March 27, 2014

1 mole of N2 = 28 g

Hence, 14 g N2 = 0.5 mole

1 mole of N2 = 6.023 x 1023 molecules of N2

0.5 mole of N2 = 0.5 mole of N2 x 6.023 x 1023 molecules of N2

                        = 3.012 x 1023 molecules of N2

1 molecule of N2 contains 14 electrons

3.012 x 1023 molecules of N2 contain 14 x 3.012 x 1023 electrons

3.012 x 1023 molecules of N2 contain 42.161 x 1023 electrons

Thus, 14 g N2 contains 42.161 x 1023 electrons.

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