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3 mole kwasu-----1000cm3
n moli-------------200cm3
n=0,6mola
300cm3---------n2 mola
1000cm3-------2mole
n2=0,6mola
n3=0,6+0,6=1,2mola
v=200+300=500cm3
1,2mola-------500cm3
x moli----------1000cm3
x=2,4mola
stezenie molowe roztworu nowego to 2,4mola/dm3