A sodium chloride saline solution begins to freeze at-1.13°C. Express the concen

Question

A sodium chloride saline solution begins to freeze at-1.13°C. Express the concentration of NaCl in this solution inmass percent. Kf for water is 1.86°C m-1
A) 3.43%
B) 1.78%
C) 0.870%
D) 17.8%
E) 8.90% Please EXPLAIN youranswer. A sodium chloride saline solution begins to freeze at-1.13°C. Express the concentration of NaCl in this solution inmass percent. Kf for water is 1.86°C m-1
A) 3.43%
B) 1.78%
C) 0.870%
D) 17.8%
E) 8.90% Please EXPLAIN youranswer.
A) 3.43%
B) 1.78%
C) 0.870%
D) 17.8%
E) 8.90% Please EXPLAIN youranswer.

Explanation / Answer

We know that t = kf*m (00C - (-1.130C)) = 1.860Cm-1 *m m = 1.13C/ 1.860Cm-1          =0.6075m          = 0.6075mol /kg So mass percent =( 0.6075mol (58.44g/mol) / kg )*100                          = ( 35.50g/ kg ) *100                         = ( 35.50x10-3kg / kg)*100                         = 3.550% hence, answer is A (3.43%)

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