CnH2n-2
a) 14n-2 = 54 <=> 14n = 56 => n = 4
F.M => C4H6
b) 1-butina
c) 1-butina + 2Br2 => 1,1,2,2-tetrabromobutan sau 2,2,3,3-tetrabromobutan
d) nr moli butina pur = 0,9×0,2 = 0,18 moli
1 mol butina...................2×80g Br2
0,18 moli butina...............x = 28,8g Br2 (md)
C = md/ms ×100 => ms = 2880/2 = 1440g Br2