Question

calculate the total no of electrons present in 1.4g of nitrogen gas

Answer 1

Number of moles in the given weight of Nitrogen gas is given by

Number of moles = Given weight/molecular weight = 1.4/28
= 0.05 moles

1 mole of Nitrogen contains Avogadro number (6.022×10^23) of Nitrogen molecules.

0.05 moles of Nitrogen contains =
0.05 × 6.022 × 10^23

= 3.011*10^22 molecules
1 molecule of Nitrogen contains = 14 electrons
3.011*10^22 molecules contains =
= 3.011 × 10^22 × 14
= 42.154 × 10^22
= 4.215 × 10^23 electrons


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