Single correct option
The number of atoms present in 0.5 mole of ozone (O₃) molecules is
- A. 0.5 × 6.022 × 10²³
- B. 3 × 6.022 × 10²³
- C. 6.022 × 10²³
- D. 1.5 × 6.022 × 10²³
Show answer and solution
Answer: (D) 1.5 × 6.022 × 10²³
One mole of ozone has 6.022 × 10²³ molecules, and each molecule has 3 atoms. So 0.5 mole has 0.5 × 3 = 1.5 moles of atoms, that is 1.5 × 6.022 × 10²³. The trap is to count molecules, 0.5 × 6.022 × 10²³, and forget that each has three atoms.
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