Question

Order the following in order of increasing vapor pressure at the same temperature (lowest to greatest)

CH4, SiCl4, GeCl4, SiH4, GeBr4

Answer 1

ANSWER:

The boiling point of the given molecule in increasing order is as

Now, since, the boiling point of a liquid is that temperature at which the vapour pressure of liquid becomes equal to atmospheric pressure. So, the liquid which is having less boiling point will have lower intermolecular force of attraction. Hence, at same temperature the liquid with lower force of attraction evaporates easily and thus it will have higher vapour pressure. Thus, liquid with lower boiling point will have higher vapour pressure than other liquids at same temperature. So, the order for vapour pressure in increasing order will be

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