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## Answers

**Given ;-**

**Molarity of pure water if its density at room temperature is 1.0 g/ cm ³.**

**To find :-**

**Molarity of pure water = ?**

**Sol ;-**

**Molarity = No. of moles of solute / Volume of solution**

**Before finding the Molarity let us find the mass of one litre of water - so therefore,**

**Mass of 1 litre = Density of water × volume**

**= 1 kg / L × 1 L**

**1 kg = 1000 grams**

**⇒ Mass of 1 kg of water = Mass / Molar Mass**

**= 1000 / 18**

**= 55.56**

**⇒ Molarity of water = 55.56 / litre**