To convert litres into moles, you have to convert the litres to grams or kilograms first.

1ml = 1gram

1litre = 1000Kg

Then you will have to calculate the molecular or atomic mass of the substance. For instance if you are calculating it for water, then 18 grams of water are equal to 1 mole of water.

So 1000Kg of water = 1000,000g/18g =>55555.55 moles

1ml = 1gram

1litre = 1000Kg

Then you will have to calculate the molecular or atomic mass of the substance. For instance if you are calculating it for water, then 18 grams of water are equal to 1 mole of water.

So 1000Kg of water = 1000,000g/18g =>55555.55 moles