How are 0.50 molNa2C03and 0.50 MNa2C03different?

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Here 0.50 mol means 0.50 moles or molecules of Na2CO3.BUT,0.50 M means molarity.Molarity =No. of moles per litre of liquid.
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"0.50 mol Na2CO3" means 0.50 x 106(molar mass) =53g of solid Na2CO3 ,whereas "0.50 M Na2CO3" means that 0.50 mol of Na2CO3 (53g) is present in 1 litre of solution.
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