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3g subst-----97g H2O
xg subst-------200g H2O
x=6,2g
d=m/v
v=m/d
v=6,2/1,52=4,1dm3=4100cm3
nalezy rozpuscic 4,1dm3 czyli 4100cm3 H2S w wodzie aaby otrzmac roztw 3%