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4.5g of urea (molar mass = 60g "mol"^(-1...

4.5g of urea (molar mass = 60g `"mol"^(-1)`) are dissolved in water and solution is made to 100 ml in a volumetric flask. Calculate the molarity of solution.

Text Solution

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Mass of Urea = 4.5 g
Moles of Urea `=("Mass ")/( "Molar Mass ")=(4.5g)/(60 g " mol "^(-1))`
`=0.075` mol
Volume of Solution = 1000 ml =`(100)/(1000)L`
`=0.1 L`
Molarity of Solution =`(" Mass of solute in g")/("Volume of Solution in litres ")`
`=(0.075)/(0.12) " mol " = 0.75`M
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