calculating kP

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Tyler Angtuaco 1G
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Joined: Wed Sep 11, 2019 12:16 am

calculating kP

Postby Tyler Angtuaco 1G » Wed Jan 15, 2020 10:40 am

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.

Posts: 149
Joined: Sat Sep 14, 2019 12:17 am

Re: calculating kP

Postby nicolely2F » Wed Jan 15, 2020 10:57 am

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.

LNgo 1G
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Joined: Sat Aug 24, 2019 12:16 am

Re: calculating kP

Postby LNgo 1G » Wed Jan 15, 2020 11:44 am

I do not think the equilibrium constant will be different if the gases are in atm, bar, etc. as long as all of the pressure values have the same units because the equilibrium constant is a ration of products to reactants.

Osvaldo SanchezF -1H
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Joined: Wed Sep 18, 2019 12:21 am

Re: calculating kP

Postby Osvaldo SanchezF -1H » Wed Jan 15, 2020 5:21 pm

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.

Bilal Pandit 1J
Posts: 98
Joined: Wed Sep 11, 2019 12:16 am

Re: calculating kP

Postby Bilal Pandit 1J » Wed Jan 15, 2020 5:29 pm

Its honestly all about being consistent, so if you use the same units for every single calculation, you should be fine.

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