Datele problemei:
nr. moli AlCl₃=4
mAl(NO₃)₃=?
Rezolvare:
AlCl₃+3AgNO₃=Al(NO₃)₃+3AgCl
precipitatul=Al(NO₃)₃
Masa molara AlCl₃=27+3*35.5=133.5g/mol
1mol............................133.5
4 moli..........................x
x=4*133.5/1=534g AlCl₃
Masa molara Al(NO₃)₃=27+3*14+3*3*16=213g/mol
y=masa de Al(NO₃)₃ obtinuta
y=534*213/133.5=852g Al(NO₃)₃