The vapor pressure of solid iodine at 25 °C is 42 mmHg. What is the vapor pressure in atm and torr?

Question

10458 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-06-10T03:08:27

$0.055$ $0.055$ $atm$ $"atm"$

$42$ $42$ $torr$ $"torr"$

We're asked to convert a given pressure value to two other units: $atm$ $"atm"$ and $torr$ $"torr"$ .

Here's a simple conversion factor:

$1$ $1$ $mm Hg = 1$ $"mm Hg" = 1$ $torr$ $"torr"$

Therefore, $42$ $42$ $mm Hg = 42$ $"mm Hg" = color(red)(42$ $torr$ $color(red)("torr"$

The conversion factor for $mm Hg$ $"mm Hg"$ and $atm$ $"atm"$ is

$\frac{1 atm}{760 mm Hg}$ $(1"atm")/(760"mm Hg")$

Therefore, using dimensional analysis,

$42$ $42$ $cancel("mm Hg")((1"atm")/(760cancel("mm Hg"))) = color(red)(0.055$ $color(red)("atm"$

rounded to $color(blue)(2$ significant figures, the amount given in the problem.