Question

Number of molecules of nitrogen
Present in 3 g of urea ?​

Answer 1

Urea = NH2CONH2 = 14+2+12+16+14+2 =60 g

Mole = 3/60

Mole = 0.05

Number of molecules of urea = 0.05 Na ( Na= Avogadro constant = 6.02× 10^23

1 molecule of urea contain 2 nitrogen atoms

0.05Na molecule of urea contain 2×0.05 Na nitrogen = 0.1 Na molecule of nitrogen