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mC=12u
mH=1u
12x/y = 9/2
24x = 9y
8x = 3y
x/y = 3/8
Wzór węglowodoru C3H8
CH3-CH2-CH3---kat.--->CH2=CH-CH3 + H2
CH2=CH-CH3 + HBr----->CH3-CH(Br)-CH3
.............................2-bromopropan