Question

Find the number of atoms in
A)14g N2
B)14 mole atom N2
C)14 U of N2

Answer 1

28g N2 contains 6.022*10^23 molecules
1g N2 contain 6.022*10^23/28 molecules
14g N2 contain 6.022*10^23/28*14
therefore no. of molecules is 3.011*10^23.

Answer 2

I think it will help you