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Z def. stęż. molowego
0,1mol HCl----1000cm3 roztworu
xmoli HCl-----400cm3 roztworu
x=0,04mola HCl
mHCl=36,5u
1mol---------36,5g
0,04mola----xg
x=1,46g HCl
Zn + 2HCl----->ZnCl2 + H2
2*36,5g HCl--------22,4dm3 wodoru
1,46g HCl-----------xdm3 wodoru
x=0,448dm3 wodoru
0,448dm3 wodoru----100%
xdm3 wodoru----------80%
x≈0,36dm3 wodoru