Question

calculate the no. of atoms 14 gram of nitrogen

Answer 1

Molar mass of nitrogen molecule N2 is 28g. Number of moles of nitrogen is given by:

No. of moles = Given mass/ molar mass

So, no. of moles = 14/28 = 0.5 moles

Now in 1 mole number of atoms is given by the Avogadro number i.e 6.023exp(23).

No. of atoms in 14g of nitrogen = 0.5*6.023exp(23)

=3.011exp(23) atoms