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n=c*v
n1=0.040dm3*12mol/dm3=0.48mola
n2=0.080dm3*5mol/dm3=0.40mola
sumujemy liczbę moli n=n1+n2=0.48+0.40=0.88mola
sumujemy objętości dodanych kwasów v=v1+v2=0.04+0.08=0.12dm3
i obliczamy stężenie molowe
c=n/v=0.88/0.12=7.33 mol/dm3