A sample of chlorine gas is collected by water displacement at 23°C. If the atmospheric pressure is 751 torr, what is the partial pressure of the chlorine?

Answer 1

A gas collected over water, is saturated with respect to water vapour, which must be taken into account.

#P_("collected")# #=# #P_(Gas) + P_(H_2O)#

#P_(H_2O)~=20*mm*Hg# at #20# #""^@C#.

So #P_(Gas)# #=# #731*mm*Hg#

#"SVP"#, #"the saturated vapour pressure"# is tabulated for a range of temperatures, and values should have been included in the question.

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Answer 2

Xavier Avery

The partial pressure of chlorine is 748 torr.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.