Calculate the number of electrons in a sample of nitrogen gas(N2) which weighs 5.6 grams.(gram molecular mass of nitrogen is 28)

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Solution

No of moles of N2 gas=given weight/molecular weight
=5.6/28
=0.2 moles
1 mole of Nitrogen contains Avogadro number (6.02310^23) of Nitrogen molecules.
0.2 moles of nitrogen contains 0.26.02310^23 molecules=1.20410^23 molecule.

1 molecule of Nitrogen contains 14 electrons.
1.20410^23 molecule contains 141.20410^23 electrons=16.85610^23 electrons.

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