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V=250ml=0.25dm³ Cm=?
m=4,8g
M=120g
n=m/M
n= 4,8g/120g/mol
n= 0,04 mola
Cm= n/V
Cm= 0,04mola/0,25dm³
Cm= 0,16 mol/dm³
Odp: Stężenie molowe r-ru wynosi 0,16 mol/dm³