The density of ' $x$ ' M solution (' x ' molar) of NaOH is $1.12 \mathrm{~g} \mathrm{~mL}^{-1}$. while in molality, the concentration of the solution is 3 m ( 3 molal). Then $x$ is (Given: Molar mass of NaOH is $40 \mathrm{~g} / \mathrm{mol}$ )
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