Define racemic mixture has the same melting point

Reference no: EM13193353

(1) Classify the following statements as true (T), or false (F). If you classify statement as false, correct it, or explain why it is false.

(a) If given stereoisomer rotates the plane of polarized light clockwise, its enantiomer rotates counter?clockwise by exactly the same magnitude

(b) If compound has one stereogenic center with S configuration, it always rotates the plane of polarized light counter-clockwise.

(d) Mixture of equal amounts of both enantiomers of given compounds does not rotate the plane of polarized light.

(e) Racemic mixture has the same melting point as both corresponding enantiomer.

(2) Specific rotation of L-alanine in water (at 25 °C) is +2.8. Suppose you have 3.00 g of mixture of L and Dalanine. You dissolved it in 10 mL of water, and measured rotation in 10 cm cell. The observed rotation was +0.12. Calculate the ee% for the mixture.

(3) Draw all stereoisomers for D-ribose. Among stereoisomers you will draw, identify the pairs of enantiomers

(4) Consider a mixture of 50 mL of cyclohexane and 50 mL of toluene.

(a) What are molar fractions of toluene and cyclohaxane in this mixture? Show your calculation.

(b) What is the boiling point of this mixture

(c) Vapor pressure of toluene at 25 °C is 26 mmHg, while vapor pressure of cyclohexane at 25 °C is 98 mmHg. Calculate the partial pressure for both toluene and cyclohexane at 25 °C for the mixture. What will be the total vapor pressure for this mixture at 25 °C? Show your work.

(d) What is the composition of the vapors for this mixture, when it boils

Reference no: EM13193353

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