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

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Answer 1 · 2017-06-10T03:08:27

$0.055$ $"atm"$

$42$ $"torr"$

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

Here's a simple conversion factor:

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

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

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

$(1"atm")/(760"mm Hg")$

Therefore, using dimensional analysis,

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

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