## Partial Pressure

205389184
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### Partial Pressure

When calculating for the reaction quotient, will the partial pressure be given in a problem or do we have to solve for it?

Shimei_2F
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Joined: Fri Aug 09, 2019 12:17 am

### Re: Partial Pressure

It should be given usually.

RasikaObla_4I
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Joined: Thu Jul 25, 2019 12:15 am

### Re: Partial Pressure

Usually they should be given or you might have to convert from moles to pressure using the ideal gas equation.

Anokhi Patel 2B
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Joined: Fri Aug 09, 2019 12:17 am

### Re: Partial Pressure

At least one quantity should be given in the problem, in order to solve for the rest of reactant and product pressures.

Alison Trinh 1E
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Joined: Thu Jul 25, 2019 12:16 am

### Re: Partial Pressure

What exactly is partial pressure and how does it relate to chemical equilibrium?

ASetlur_1G
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Joined: Fri Aug 09, 2019 12:17 am

### Re: Partial Pressure

^ Partial pressure is the amount of pressure each gas would exert if it were the only gas in the volume. We express the amount of a gas at equilibrium in terms of its partial pressure.

Nathan Rothschild_2D
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Joined: Fri Aug 02, 2019 12:15 am

### Re: Partial Pressure

Will the partial pressure of the gases always add to the same thing on both sides of the reaction?

Angela Wu-2H
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Joined: Fri Aug 30, 2019 12:16 am

### Re: Partial Pressure

Can partial pressure be measured in bars and atm or just bars?

alicechien_4F
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Joined: Sat Jul 20, 2019 12:15 am

### Re: Partial Pressure

Angela Wu-2H wrote:Can partial pressure be measured in bars and atm or just bars?

Partial pressure can be measure in both bars and atm. I believe for this class, we will assume 1 bar = 1 atm, but you can also convert if necessary.

Caroline Zepecki
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Joined: Fri Aug 09, 2019 12:16 am

### Re: Partial Pressure

You most likely should be given the partial pressure to complete a problem where you're either solving for Qp or Kp.

Bella Townsend
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Joined: Wed Feb 20, 2019 12:18 am

### Re: Partial Pressure

I'm confused on the meaning on Kc and the difference between Kc and K with other subscripts.

gabbymaraziti
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### Re: Partial Pressure

How can we convert between atm and bars? The examples in the book show that the conversion is not 1:1.

Emma Joy Schaetz 1E
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Joined: Wed Sep 18, 2019 12:16 am

### Re: Partial Pressure

How do we know when to use K_c and when to use Partial Pressure Notation?

Emma Joy Schaetz 1E
Posts: 43
Joined: Wed Sep 18, 2019 12:16 am

### Re: Partial Pressure

Why are solids and liquids not included when calculating K values?

Emma Joy Schaetz 1E
Posts: 43
Joined: Wed Sep 18, 2019 12:16 am

### Re: Partial Pressure

905289082 wrote:You most likely should be given the partial pressure to complete a problem where you're either solving for Qp or Kp.

What is the difference between Kc and Kp?

605395381
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Joined: Mon Jun 17, 2019 7:24 am

### Re: Partial Pressure

Partial pressure (from what I have seen) is usually given in the problem. But I do not doubt that we might have to solve for Partial Pressure in some cases.

Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

### Re: Partial Pressure

In regards to what the difference is between Kc and Kp:

Kc represents the equilibrium concentrations of reactants and products, while Kp suggests the equilibrium partial pressures of the reactants and products

Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

### Re: Partial Pressure

Emma Joy Schaetz 1E wrote:Why are solids and liquids not included when calculating K values?

I believe solids and liquids are not included when calculating K values because their concentrations don't change significantly over the course of a reaction. Can anyone confirm this? I'm not exactly sure if this is the right explanation.

Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

### Re: Partial Pressure

Emma Joy Schaetz 1E wrote:How do we know when to use K_c and when to use Partial Pressure Notation?

Kc notation is used when the reactants and products of a homogeneous reaction are in the aqueous phase, while partial pressure notation is used when the reactants and products of a homogeneous reaction are in the gas phase.
Kc = use brackets
Kp = use parentheses

Michelle Xie 2B
Posts: 99
Joined: Sat Aug 17, 2019 12:18 am

### Re: Partial Pressure

Usually, it will be given.