Which of the following pairs of samples contain an exactly identical number of total atoms? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Evaluate the total moles of atoms for each. (A) $16\text{ g } O_2 = 0.5\text{ mol } O_2 \implies 0.5 \times 2 = 1.0\text{ mol}$ atoms. $14\text{ g } N_2 = 0.5\text{ mol } N_2 \implies 0.5 \times 2 = 1.0\text{ mol}$ atoms (Equal). (B) $1\text{ g } O_2 = 1/32\text{ mol } O_2 \implies 2/32 = 1/16\text{ mol}$ atoms. $1\text{ g } O_3 = 1/48\text{ mol } O_3 \implies 3/48 = 1/16\text{ mol}$ atoms (Equal). (C) $4\text{ g } H_2 = 4\text{ mol}$ atoms; $28\text{ g } N_2 = 2\text{ mol}$ atoms (Unequal). (D) $0.5\text{ mol } CH_4 = 0.5 \times 5 = 2.5\text{ mol}$ atoms; $1.0\text{ mol } CO_2 = 1 \times 3 = 3.0\text{ mol}$ atoms (Unequal).