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JAMB Chemistry 1994 Question 3

Question 3

Gas Laws

At the same temperature and pressure, 50 cm3 of nitrogen gas contains the same number of molecules as

  1. A.25 cm3 of methane
  2. B.40 cm3 of hydrogen
  3. C.50 cm3 of ammonia
  4. D.100 cm3 of chlorine
Show the answer and explanation

Answer: C (50 cm3 of ammonia)

Explanation

Avogadro's law: equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. So 50 cm3 of any gas, such as ammonia, matches.