1.

0.1 molal aqueous solution of sodium bromide freezes at -0.335^(@)C at atmospheric pressure. K_(f) for water is 1.86^(@)C. The percentage of dissociation of the salt in solution is

Answer»

90
80
58
98

Solution :`DELTA T_(f) = i K_(f) m or 0.335 = i xx 1.86 xx 0.1 or i= 1.80 `
`alpha = (i-1)/(n-1) = (i-1)/(2-1)` For NABR `i = 1 + alpha or alpha = 0.80 = 80%`


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