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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: tmlfan_17 on October 12, 2013, 04:17:24 PM

Title: Chemical Properties Problems
Post by: tmlfan_17 on October 12, 2013, 04:17:24 PM

Hi there, I was hoping that someone could solve the following problems (and provide an answer), in order to see if I got the same solutions. Your final answer is all that would be appreciated.

1. When another atom or group of atoms is substituted for one of the hydrogen atoms in benzene, C₆H₆, the boiling point changes. Explain the order of the following boiling points: C₆H₆, 80°C; C₆H₅Cl, 132°C; C₆H₅Br, 156°C; C₆H₅OH, 182°C.
2. (a) What are the partial and total vapour pressures of a solution obtained by mixing 35.8 g benzene, C₆H₆ (l), and 56.7 g toluene, C₇H₈ (l), at 25 °C? At 25 °C, the vapour pressure of liquid  C₆H₆ = 95.1 mmHg; the vapour pressure of liquid C₇H₈ = 28.4 mmHg.
(b) Determine the mole fraction of benzene in the vapour above this benzene–toluene solution.

Title: Re: Chemical Properties Problems
Post by: Borek on October 12, 2013, 05:22:51 PM

You have to show your attempts at solving the question to receive help. This is a forum policy.

So, show us YOUR answer (preferably explaining how you got it), and with some luck someone will try to solve the problem and tell you whether he got the same result.