1.

At a certain Hill station, water boils at 96^(@)C. The amount of NaCl that should be added to one litre of water so that it boils at 100^(@)C will be (K_(b) for H_(2)O=0.52K//m)

Answer»

450 g
225 g
125 g
250 g

Solution :Required `DeltaT_(b)=100-96=4^(@)`
`DeltaT_(b)=iK_(b)m=iK_(b)(w_(2))/(M_(2))XX(1)/(w_(1))xx1000`
`"i.e.,"4=2xx0.52xx(w_(2))/(58.5)xx(1)/(1000)xx1000`
`"or"w_(2)=225g""("1 L "H_(2)O=1000g)`


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