How are 0.50 m Na2CO3 and 0.50 M Na2CO3 different?

How are 0.50 m Na2CO3 and 0.50 M Na2CO3 different?
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Ans. 0.50 m Na2CO3 solution means that 0.5 mol (or 53g) of Na2CO3 are present in 1000 g of solvent.
 0.50 M Na2CO3 solution means that 0.5 mol (or 53g) of Na2CO3 are present in 1L of solution.
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