Question

calculate the number of molecules presemt in 1.4g of N2 molecule

Answer 1

First we will see whether nitrgen is monatomic diatomic

Nitrogen is diatomic

No of atoms=2

Atomic mass = 2×14=28

We know,

No of moles = given mass/molecular mass

N=1.4/28=0.05

No of atoms= n× 6.022×10^23

n=0.05×6.022×10^23= 3.011 ×10^22

Hope this helped!!!