Answer to Question #89840 in General Chemistry for John Dodds

Question

Phenylcarbinol is used in nasal sprays as a preservative. A solution of 0.52 g of the compound in 25.0 g of water has a melting point of-0.36 °C. What is the molar mass of phenylcarbinol? (Kp for water is -1.858°C/m.)

Answer 1

Kp (O)= -1.858 /m

Mr (phenilcarbinol) =?

Solution: According to cryoscopy law

.t= Kp=

From which Mr = = = 107.35

Answer : Mr (phenilcarbinol) =107.35