What is the molarity of solution containing $0 \cdot 8 \mathrm{~g}$ of $\mathrm{NaOH}$ (Molar mass $40…

What is the molarity of solution containing $0 \cdot 8 \mathrm{~g}$ of $\mathrm{NaOH}$ (Molar mass $40 \mathrm{~g} \mathrm{~mol}^{-1}$ ) in $150 \mathrm{~cm}^{3}$ of water?
  1. $0 \cdot 02 \mathrm{~mol} \mathrm{dm}^{-3}$
  2. $0 \cdot 12 \mathrm{~mol} \mathrm{dm}^{-3}$
  3. $5 \cdot 33 \mathrm{~mol} \mathrm{dm}^{-3}$
  4. $0 \cdot 1333 \mathrm{~mol} \mathrm{dm}^{-3}$

Solution

$n = 0.8/40 = 0.02$ Volume $= 0.15 ~L$ Molarity $= 0.02 /0.15 = 0.133 \mathrm{~mol ~dm^{-3}}$

Asked in: MHT CET 2020 (20 Oct Shift 2)

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