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  4. How much volume (in litre) of 3M NaOH is obtained from 80 g NaOH ? (Atomic mass of Na=23u )

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Q. How much volume (in litre) of $ 3M\,NaOH $ is obtained from 80 g $ NaOH $ ? (Atomic mass of $ Na=23u $ )

Rajasthan PETRajasthan PET 2009

Solution:

Molarity $ =\frac{weight}{molecular\text{ }weight\times volume\text{ }of\text{ }solution\text{ }(in\text{ }litre)} $
$ \Rightarrow $ $ 3M=\frac{80}{40\times V} $
$ V=\frac{2}{3}=0.67L $