Due before lab begins. Answer in space provided. 1. The normal boiling point of

Question

Due before lab begins. Answer in space provided. 1. The normal boiling point of cyclohexane is 81.0 degree C. What is the vapor pressure of cyclohexane at 81.0 degree C? 2. What effect would a decrease or increase in barometric pressure have on the boiling point? 3. If a mixture distilled rapidly, the separation of its compound is poorer than if the mixture is distilled slowly. Explain. 4. A chemist has a small amount of compound ( b.p. = 65 degree C) that must be fractionally distilled. Yet, the Chemist does not want to lose any of the compound to hold up on the column. What the chemist should do?

Explanation / Answer

1) the vapor pressure is equal to the atmospheric pressure

2)A decrease in the barometric pressure will cause a reduction in the boiling point of the liquid

A increase in the barometric pressure will cause a rise in the boiling point of the liquid

3) this is due to the equilibrium between liquid and gas phases is not reached properly.

4) He should try another separation technique as cromathography.

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