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V1=50cm³=0.05dm³
C1=3 mol/dm³
V2=0.25dm³
C2= 2mol/dm³
Vkońcowe= V1+V2 = 0.05 + 0.25 = 0.3 dm³
C=n/V
n=C*V
n1=C1*V1=3*0.05=0.15 mol
n2=C2*V2=2*0.25=0.5
nkońcowe=n1+n2=0.15+0.5=0.65
Ckońcowe = nk/Vk =0.65/0.3=2.2mol/dm³