The Fischer projection formula of (S)-proline is to be given. Concept introduction: In Fischer projection formula, the amino acid molecule is represented by placing the COO- group on the top of the chiral carbon. The configuration in which the NH 3 + group is placed on right is said to be D configuration while that which has NH 3 + group on the left is called to have L configuration. Based on sequence rules, the four groups attached to the chiral carbon are arranged in the order of priorities. While viewing the molecule from the side far away from the group of lowest priority, if the arrangement of first highest priority, second highest priority and third highest priority is clockwise the molecule is said to have R configuration and if the arrangement is anti-clockwise the molecule is said to have S configuration. To draw: The Fischer projection formula of (S)-proline.

Question

Use the vapor-liquid equilibrium data at 1.0 atm. for methanol-water (Table 2-8 ) for the following: If the methanol vapor mole fraction is 0.600, what is the methanol liquid mole fraction? Is there an azeotrope in the methanol-water system at a pressure of 1.0 atmospheres? If water liquid mole fraction is 0.350, what is the water vapor mole fraction? What are the K values of methanol and of water at a methanol mole fraction in the liquid of 0.200? What is the relative volatility αM-W at a methanol mole fraction in the liquid of 0.200?

Answer 1

Question

Chapter 26.SE, Problem 31AP

Interpretation Introduction

Interpretation:

The Fischer projection formula of (S)-proline is to be given.

Concept introduction:

In Fischer projection formula, the amino acid molecule is represented by placing the COO- group on the top of the chiral carbon. The configuration in which the NH₃⁺ group is placed on right is said to be D configuration while that which has NH₃⁺ group on the left is called to have L configuration.

Based on sequence rules, the four groups attached to the chiral carbon are arranged in the order of priorities. While viewing the molecule from the side far away from the group of lowest priority, if the arrangement of first highest priority, second highest priority and third highest priority is clockwise the molecule is said to have R configuration and if the arrangement is anti-clockwise the molecule is said to have S configuration.

To draw:

The Fischer projection formula of (S)-proline.

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Use the vapor-liquid equilibrium data at 1.0 atm. for methanol-water (Table 2-8 ) for the following: If the methanol vapor mole fraction is 0.600, what is the methanol liquid mole fraction? Is there an azeotrope in the methanol-water system at a pressure of 1.0 atmospheres? If water liquid mole fraction is 0.350, what is the water vapor mole fraction? What are the K values of methanol and of water at a methanol mole fraction in the liquid of 0.200? What is the relative volatility αM-W at a methanol mole fraction in the liquid of 0.200?

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