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A certain substance X has a normal boiling point of 101.5°C and a molar boiling point...

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Chemistry

A certain substance X has a normal boiling point of101.5°C and a molar boiling point elevation constantKb = 1.49 °C/m. A solution is preparedby dissolving some urea (NH2)2CO in 200 g ofX. This solution boils at 104.4°C. What is the mass ofurea that was dissolved in the solution?

A. 23.4 g
B. 6.48 g
C. 584 g
D. 9.73 g
E. 1.95 g

Question 10 of 10

1.0 Points

The normal freezing point of a certain liquid Y is-8.70°C, but when 24.17g of urea (NH2)2CO aredissolved in 550 g of Y, it is found that the solutionfreezes at -13.7°C instead. Use this information to calculate themolal freezing point depression constant Kf ofsubstance Y.

A. 0.15°C/m
B. 3.7°C/m
C. 31°C/m
D. 6.8°C/m
E. 5.0°C/m

Answer & Explanation Solved by verified expert
4.2 Ratings (538 Votes)
9 We know that T b Kbx m Where T b elevation in boiling point boiling point of solution boilinging point of pure solvent 1044    See Answer
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