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I think you would be given the units of the pressure of a gas. If they ask for a different unit in the answer, then you could just convert between the units, but bar and atm are very similar in value so there is not much difference between their values.
The question should always specify the units, since the gas constant we use is dependent on the units of the problem. Furthermore, it would only matter when choosing the gas constant because bar and atm are essentially equivalent.
Gases for the partial pressure use atm and bars interchangeably (since they are basically the same value/ a lot like Watts and Joules if that makes any sense). It's just that our books use bars rather than atm. more often.
The question should mention the units that are being used whether it be bar or atm, but Dr.Lavelle did mention that for this class we would be using atm and bar interchangeably although they are not necessarily equal.
Typically, the units of the gas will be given in the equation. Bar is the SI unit for gas, so if it does not say a unit, it may be safe to assume that the gas is measured in bar. However, atm and bar are so close that the professor said we can typically trade them out without consequence.
Although bar is technically the correct unit to use for pressure in equilibrium equations, we use bar and atm interchangeably in this class. Dr. Lavelle said that we will usually use atm, but a problem might give you bar instead.
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