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ms=Cp*mr/100%
ms=12*90/100=10,8g
mr=ms/Cp*100%
mr=10,8/26*100=41,5g
41,5-10,8=30,7g
d=m/v
v=m/d
V NaCl=10,8/17=0,635cm3
V H2O=30,7/1=30,7cm3