NH4Cl => NH3 + HCl
m nh4cl = 1.5 kg= 1500 g
53.5 g NH4Cl genereza 17 g NH3
1500 g NH4Cl genereaza a g NH3
a = (1500 x 17) /53.5
a= 476. 64 g NH4 ( m pur)
p = (m pur/ m impur) /100
m impur= (m pur x100)/ p
m impur = 476.64 x 100 /90 =>
m impur = 529.6 g