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JAMB Chemistry 1991 Question 43

Question 43

Hydrocarbons

How many grams of bromine will be required to completely react with 10 g of propyne? [C = 12, H = 1, Br = 80].

  1. A.20g
  2. B.40 g
  3. C.60 g
  4. D.80 g
Show the answer and explanation

Answer: D (80 g)

Explanation

C3H4 (40 g/mol) adds 2Br2 (320 g). 10 g of propyne is 0.25 mol, which needs 0.5 mol of Br2 = 80 g.