passwella.
Menu

JAMB Chemistry 1995 Question 6

Question 6

Gas Laws

Two cylinders A and B each contains 30 cm3 of oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is

  1. A.3.2 g
  2. B.6.4 g
  3. C.80.0 g
  4. D.160.0 g
Show the answer and explanation

Answer: D (160.0 g)

Explanation

Equal volumes at the same temperature and pressure hold equal numbers of moles (Avogadro's law), so there are 5.0 mol of O2. Mass = 5.0 × 32 = 160.0 g.