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On a certain hill station, pure water is found to boil at 95^(@)C. How many grams of NaCl must be added to 2 kg of water so that it boils at 100^(@)C?

Answer»


SOLUTION :`DeltaT_(b)=100-95=5^(@),DeltaT_(b)=iK_(b)m"or"m=(DeltaT_(b))/(iK_(b))=(5)/(2xx0.52)=4.807`
`"1000 G should CONTAIN NaCl = 4.807 moles "=4.807xx58.5g`
`therefore"2000 g should contain NaCl "=2xx4.807xx58.7=562.42g.`


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