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V=120cm3=0,12dm3
Cp=20%
d=1,141g/cm3=1141g/dm3
n=?
Cm=(Cp*d):M*100%
Cm=(20*1141):98*100
Cm=2,33 mol/dm3
Cm=n/V
n=Cm*V
n= 2,33*0,12
n=0,28 mola