Calculating Pressure of a Gas Mixture Using PV=nRT


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Chris Freking 2G
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Calculating Pressure of a Gas Mixture Using PV=nRT

Postby Chris Freking 2G » Sun Feb 10, 2019 5:33 pm

It is given that the gas mixture has 2.250 mol of helium gas and 1.492 mol of krypton gas. The temperature of the system is 348.15K and the volume of the system is 11.0L.

To calculate the total pressure of the system, do we first calculate the pressure using mol of helium gas, then calculate the pressure using mol of krypton gas, and finally add the two pressures together?

As in:
nheliumRT/V + nkryptonRT/V = P ?

(This question is in reference to 5B on Lyndon's worksheet)

Iris Bai 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

Re: Calculating Pressure of a Gas Mixture Using PV=nRT

Postby Iris Bai 2K » Sun Feb 10, 2019 5:34 pm

Yes, but you can also just add the moles of helium and krypton together before calculating anything. The answer wont change.

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Calculating Pressure of a Gas Mixture Using PV=nRT

Postby 804994652 » Sun Feb 17, 2019 11:07 pm

You can also solve for each one individually and then add them together

jocelyntzeng
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: Calculating Pressure of a Gas Mixture Using PV=nRT

Postby jocelyntzeng » Sat Mar 16, 2019 12:55 pm

can add them together then solve, or solve them separately and add together


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