<p>The density of 2 M aqueious solution of NaOH is 1.28 g/<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><msup><mi>m</mi><mn>3</mn></msup></math>. The molality of the solution is:</p>

<p>(Given that molecular mass of NaOH = 40g&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><mi>o</mi><msup><mi>l</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>)</p>