Question

calculate the no. of particles in each of the following:
7g of nitrogen molecules
.5 moles of carbon atoms {given that N=14u; C=12u, N0=6.022*1023 mol​ -1}

Answer 1

Mass of nitrogen= 14 g

Given mass= 7 g

Moles= Given mass/ Molecular mass

=7/14= 1/2 mole

=1/2× 6.022×10^23

= 3.011×10^23

(Actually, Avogadro constant= 6.023×10^23)