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.