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d=1,1g/cm3
m=v*d
m=200*1,1
m = 220g
mr=220g
Cp=20%
ms=Cp*mr/100%
ms=20*220/100
ms=44g HCl
mHCl=36,5u
Zn + 2HCl ---> ZnCl2 + H2
1mol Zn ------ 2*36,5g HCl
xmoli Zn ------ 44g HCl
x = 0,6mola Zn