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How are 0.5 m of NaOH different from 0.5...

How are 0.5 m of NaOH different from 0.5 M of NaOH ?

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0.5 m of NaOH means that 0.5 mole (20.0 g) of NaOH are dissolved in 1000 g of the solvent
0.5 M of NaOH means that 0.5 mole (20.0 g) of NaOH are dissolved in 1000 mL of the solution.
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DINESH PUBLICATION-MOLE CONCEPT-Concept Based Question
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