The number of moles of in 13.5 g is : — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

**Solution:** **Step 1: Calculate molar mass of $SO_2Cl_2$** $$M = S + 2(O) + 2(Cl)$$ $$M = 32 + 2(16) + 2(35.5)$$ $$M = 32 + 32 + 71 = 135 \text{ g/mol}$$ **Step 2: Use moles formula** $$n = \frac{\text{mass}}{\text{molar mass}}$$ $$n = \frac{13.5}{135} = 0.1 \text{ mol}$$ **Answer: 0.1 moles** The correct answer is **A** because dividing the given mass (13.5 g) by the calculated molar mass (135 g/mol) yields exactly 0.1 moles. This straightforward application of the mole concept gives a clean result—13.5 g is precisely one-tenth of the molar mass.