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mCl2=71u
71g Cl2 ------ 22,4dm3
xg Cl2 --------- 2,3dm3
x = 7,29g Cl2
ms=7,29g
mw=1000g
mr=ms+mw
mr=7,29g+1000g=1007,29g
Cp=ms*100%/mr
Cp=7,29*100/1007,29
Cp = 0,72%