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x mola---->0,25dm3
3mole ----> sa w 1dm3 x=0,5 mola
x mola ----> 0,05 dm3
x=0,15 mola
n=0,15mola+0,5mola = 0,65mola
V=0,05dm3+0,25dm3
V=0,3dm3
Cm=n/V
Cm=0,65/0,3
Cm=2,17 mola/dm3