passwella.
Menu

JAMB Chemistry 2002 Question 5

Question 5

Mole Concept and Stoichiometry

Which of the following gases contains the least number of atoms at s.t.p.?

  1. A.1 mole of butane
  2. B.3 moles of ozone
  3. C.4 moles of chlorine
  4. D.7 moles of argon
Show the answer and explanation

Answer: D (7 moles of argon)

Explanation

Count moles of atoms: butane C4H10 1 × 14 = 14; ozone O3 3 × 3 = 9; chlorine Cl2 4 × 2 = 8; argon (monatomic) 7 × 1 = 7. Argon has the fewest atoms.