Page 1 of 1

Gas Constant

Posted: Sun Jan 26, 2020 6:43 pm
by Viviana Velasquez
Which gas constant are we expected to use for the equation PV=nRT?

Re: Gas Constant

Posted: Sun Jan 26, 2020 6:46 pm
by Kimberly Koo 2I
0.08206 L.atm.mol.K

Re: Gas Constant

Posted: Sun Jan 26, 2020 6:49 pm
by TarynD_1I
The gas constant depends on which measurement that the question uses (J, atm, bar, or torr usually) and it will be on the equations sheet.

Re: Gas Constant

Posted: Sun Jan 26, 2020 9:57 pm
by Anna Chen 1K
The value for the gas constant depends on the units used in the specific question.

Re: Gas Constant

Posted: Sun Jan 26, 2020 9:59 pm
by Anna Heckler 2C
Use the gas constant that has the same units as the other values you are using in the calculation. For example, if your pressure is in atm, then use the gas constant that has the unit with atm (so they match and cancel).

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:05 pm
by 105311039
Every question can possibly be different, so you can necessarily pinpoint down one equation. It just depends on the question and units.

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:07 pm
by stephaniekim2K
There's a few different gas constants for different units but they are the same constant, just with different units. They are all on the formula sheet.

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:07 pm
by Charysa Santos 4G
The gas constant (R) depends on what other units are given to you when calculating PV = nRT. The units are included on the formula/equation sheet.

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:27 pm
by J_CHEN 4I
Use the constant that includes the unit that is the same as the P in PV=nRT (so units cancel out nicely).

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:34 pm
by Sean Tran 2K
The gas constant needed will be based on the units of pressure. The constants should be on the formula sheets during tests.

Re: Gas Constant

Posted: Sun Jan 26, 2020 10:57 pm
by AronCainBayot2K
The Gas Constant value is determined based on the pressure usually and other components in the ideal gas law equation. Pressure can be measured in atm, bar, etc, and R is represented in many of those units.

Re: Gas Constant

Posted: Sun Jan 26, 2020 11:33 pm
by Jesse Anderson-Ramirez 3I
The constants will be given on the formula sheet during the exams.

Re: Gas Constant

Posted: Sun Jan 26, 2020 11:41 pm
by kausalya_1k
It honestly depends what units P, V, and T are given. Typically we use .08206 L atm/mol K, but it really depends on units for the given values.

Re: Gas Constant

Posted: Tue Jan 28, 2020 4:04 pm
by Astrid Lunde 1I
The gas constant is given on the formula sheet, make sure you chose the one with the units that apply to the equation.