Question

calculate number of H-atoms in 9g of NH4^+

Answer 1

NH4

M wt = 18

9 gm = 9/18 = 0.5 moles

1 mole of NH4 contains 4N atoms of H

0.5 moles contains 2N atoms of H

= 12.05 x 10^23 atoms

= 1.205 x 10^24 atoms of H