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n-liczba moli
V-objętość
Cm=n/V
250cm3=0,25dm3
0,2=n/0,25
n=0,2 x 0,25
n=0,05
1 mol AlCl3-133,5g
0,05mola - X
X=6,68g
odp.Potrzeba 6,68g chlorku glinu