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calculate the mas of NACl (molar mass = 58.5 g mol) to bedissolved in 40 g of water to lower the freezing point by 2 degree celsius, assuming that NACl undergoes complete dissociation. [ Kf for water = 1.86 K mol]

calculate the mas of NACl (molar mass = 58.5 g mol) to bedissolved in 40 g of water to lower the freezing point by
2 degree celsius, assuming that NACl undergoes  complete dissociation. [ Kf for water = 1.86 K mol] 

Grade:12

1 Answers

Vikas TU
14149 Points
5 years ago

This is a colligative property based question.we know the formula for lowering of freezing point is :-

i*K*m=del T

Here m is molality and K is the dissociation constant. On applying the formula we get the mass of NaCl to be 1.25g.

 

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