Question

Arrange these compounds by their expected vapor pressure: H2O NCl3 Br2

Answer 1

Answer: Given compounds are arranged in decreasing order of their vapor pressure as follows.

`Br_(2)` >
`NCl_(3)` >
`H_(2)O`

Step-by-step explanation:

Vapor pressure is defined as the pressure exerted by the vapors which are present on the surface of a liquid. Less is the intermoecular forces present within the molecules of a substance more will be its vapor pressure.

For example,
`Br_(2)` is a gas and there exists Vander waal forces between its molecules. Hence, it has more vapor pressure than
`NCl_(3)` and
`H_(2)O`.

In
`H_(2)O`, there exists hydrogen bonding which is stronger than bonding present in
`NCl_(3)`. So,
`H_(2)O` has low vapor pressure.

In
`NCl_(3)`, there exists dipole-dipole interaction which is stronger than Vander waal forces but weaker than hydrogen bonding.

Therefore, given compounds are arranged in decreasing order of their vapor pressure as follows.

`Br_(2)` >
`NCl_(3)` >
`H_(2)O`