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ms=20g
mw=180g
mr=ms+mw
mr=200g
Cp=ms*100%/mr
Cp=20*100/200
Cp = 10%
2)
v=1000cm3
d=1,115g/cm3
m=v*d
m=1000*1,115
m=1115g
mr=1115g
Cp=10%
ms=Cp*mr/100%
ms=10*1115/100
ms = 111,5g NaOH