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Are there certain units of pressure that need to be converted in order to use partial pressure values when calculating the equilibrium constant? Certainly, the equilibrium constant would be different if we were to use kilopascals instead of atmospheric pressure.
The standard unit is atm. I think all exercises will give partial pressures in atm but in case you need to convert a number to/from Pascals (1 atm = 101 325 Pa), you can find the conversion in the Constants and Equations PDF on Dr Lavelle's website.
The important aspect of finding the equilibrium constant is to see how much reactant is converted to product so to do that, you find the ratio. So even if you do the conversion it will not matter because the changes in the reactant and product will be the same so therefore the same ratio will still occur. Only situation where not converting is important is in temperature because the ratio of Kelvin and Celsius would not be the same for equal values. We however do not need to worry about this.
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