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d=m/V
a) tlenu O₂
m=32g
d=23/22,4
d=1,43g/dm³
b)tlenek węgla (II) CO
m=28g
d=28/22,4
d=1,25g/dm³
c)azot N₂
m=28g
d=28/22,4
d=1,25g/dm³
d)wodór H₂
m=2g
d=2/22,4
d=0,089g/dm³
e)siarkowodór H₂S
m=34g
d=34/22,4
d=1,52g/dm³