Question

Calculate the no. Of molecules in 14g of nitrogen gas

Answer 1

For calculation you can use this formula

n[mol]=m[g]/M[mol/g]

The molar mass of nitrogen molecules is M(N2)=28g/mol.

n = 4g / 28g/mol= 0.143mol

4g nitrogen molecules are 0.143mol.

Answer 2

m=14g

M=N2=14×2=28

n=14/28=1/2=0.5mole