passwella.
Menu

JAMB Chemistry 2001 Question 3

Question 3

Gas Laws

25cm3 of a gas X contains Z molecules at 15°C and 75 mmHg. How many molecules will 25 cm3 of another gas Y contain at the same temperature and pressure?

  1. A.2Y
  2. B.2Z
  3. C.Z
  4. D.Y
Show the answer and explanation

Answer: C (Z)

Explanation

Avogadro's law: equal volumes of all gases at the same temperature and pressure contain the same number of molecules, so Y also contains Z molecules.