OnlineCBT
Chemistry · Some Basic Concepts of Chemistry
हिन्दीIf the density of methanol is \( 0.793\text{ kg L}^{-1} \), what is its volume needed for making \( 2.5\text{ L} \) of its \( 0.25\text{ M} \) solution? (Molar mass = \( 32\text{ g mol}^{-1} \))
Correct answer · Option 3
25.22 mL
Explanation
Moles = \( 2.5 \times 0.25 = 0.625\text{ mol} \); Mass = \( 0.625 \times 32 = 20\text{ g} \). Volume = \( \frac{20\text{ g}}{793\text{ g L}^{-1}} = 0.02522\text{ L} = 25.22\text{ mL} \).
