Notez cu "*" înmulțirea si cu "/" linia de fractie
a) MNa2Co3 = 2*23+12+16*3=106g/mol
b)raport masic Na2CO3=46:12:48
raport atomic
Na2Co3=2:1:3
c)%Na=mNa/M*100=46/106*100=43.39
%C=mC/M*100=12/106*100=11.32
%O=mO/M*100=48/106*100=45.28
d)n=m/M=16/106=0.15 moli
e)MNH4No3=14+4+14+48=80g/mol
106 Kg Na2Co3.........1 kmol NH4NO3
x Kg ...............2 kmoli NH4NO3
x=106*2=212 kg Na2Co3
M-masa molara