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cm*v=n
n=0,5 mola
1 mol cl2---------71g
0,5mola-------xg
x=35,5g
1 mol gazu w warunkach normalnych ma objetosc 22,4dm3(22400cm3)
v=m/d
d= m/v
d=35,5g/22400cm3=0,0016g/cm3