# On heating 69 g of ethanol with concentrated sulfuric acid used as a catalyst, several compounds were formed, one of which completely

On heating 69 g of ethanol with concentrated sulfuric acid used as a catalyst, several compounds were formed, one of which completely reacts with 120 g of a 40% solution of bromine with carbon tetrachloride. The second compound is a flammable liquid. Determine the mass of compounds formed during heating of ethanol, assuming that the alcohol has completely reacted. C2H5OH – (H2SO4) → C2H4 + H2O
C2H4 + Br2 – (CCl4) → C2H4Br2
2C2H5OH – (H2SO4) → C2H5OC2H5 + H2O
m (pure bromine) = 120 x 0.4 = 48 g
n (Br2) = 48/160 = 0.3 mol
⇒ n (C2H4) = 0.3 mol
m (C2H4) = 0.3 x (24 + 4) = 8.4 g
m (C2H5OH in the first reaction) = 0.3 x (25 + 5 + 17) = 13.8 g
m (C2H5OH in the second reaction) = 69 – 13.8 = 55.2 g
n (C2H5OH in the second reaction) = 55.2 / 46 = 1.2 mol
⇒ n (С4Н10O) = 1.2: 2 = 0.6 mol
m (C4H10O) = 0.6 x (24 + 24 + 10 + 16) = 44.4 g
Answer: the mass of ethylene is 8.4 g, the mass of dimethyl ether is 44.4 g. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.