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Molar concentration is the number of moles of a substance per litre.

One litre of pure water is 1kg, or 1,000 grams.

The molecular mass of water is approximately 18 grams per mole.

Therefore, there are 1,000/18 = 55.56 mole of water in a litre of water, giving a concentration of 55.56 M.

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Q: Why molar concentration of water is 55.56?
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