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1. C2H5OH (t>140°,h2so4(k))= C2H4 + H2O

C2H4 + Br2 = C2H4Br2

C2H4Br2 + 2KOH (сп)= C2H2 + 2KBr + 2H2O

3C2H2 (Cakt,t=420°)= C6H6

2. m(CuS)= 181 г

H2SO4, O2

V(SO2) — ?

CuS + H2SO4 = CuSO4 + H2S

181/96 = x/34

x = 64 г

2H2S + 3O2 = 2H2O + 2SO2

64/68 = y/44.8

y = 42.16 л

3. CnH2n+1COOH

W(C) = ((n+1)*Ar(C))/M(CnH2n+1COOH)

0.4 = (12n+12)/(12n+2n+1+12+32+1)

0.4 = (12n+12)/(14n+46)

5.6n+18.4 = 12n+12

-6.4n = -6.4

n = 6.4/6.4 = 1 ==> CH3COOH - уксусная кислота.