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Eileen Quach Dis 2A wrote:I was wondering why when we calculate partial pressure the answer could be either in bars or moles per liter. Is there any unit out of the two that is preferred?
Usually the units preferred are given in the question or you can deduce the best units from the units given! Sometimes on tests as well Dr. Lavelle will specify which units to use in answer.
Bar is the SI unit for the gas pressure and 1 bar is very close to 1 atm so we can use either of them, when the gas is presented in mols per liter it is showing its concentration and can be converted to pressure through ideal gas law.
The preferred unit will be atm! You should not give an answer in moles per liter as that would be the unit for concentration rather than pressure. You can easily convert between the two as Dr. Lavelle taught in lecture.
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