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CBSE Class 12-science Answered

Depression in freezing point is 6 K for NaCl solution if kf for water is 1.86 K/kg mol, amount of NaCl dissolved in 1 kg water is (a)3.42 (b)1.62 (c)3.24 (d)1.71  
Asked by Balbir | 17 Jul, 2019, 04:43: PM
answered-by-expert Expert Answer
Depression in freezing point is given by this formula
increment T subscript f equals m cross times K subscript f
increment T subscript f equals fraction numerator w over denominator M cross times W end fraction cross times K subscript f
increment T subscript f equals D e p r e s s i o n space i n space f r e e z i n g space p o i n t
w space i s space w e i g h t space o f space s o l u t e space i n space g r a m
M space i s space m o l e c u l a r space w e i g h t space o f space s o l u t e
W space i s space w e i g h t space o f space s o l v e n t space i n space k g

6 equals fraction numerator w over denominator 58.5 cross times 1 end fraction cross times k subscript f
k subscript f equals 1.86 space K divided by k g space m o l

6 equals fraction numerator w over denominator 58.5 end fraction cross times 1.86
w equals 188.7 space g r a m
space space space space equals 0.188 space k g space
Answered by Ravi | 18 Jul, 2019, 06:40: PM
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