R constant for PV=nRT

[Jessica Castellanos]

What is the the value of R in PV=nRT? I've seen two different values and don't know which is which.

[Kevin Antony 2B]

R is equal to 8.3145 x 10^-2

[sarahforman_Dis2I]

What is the the value of R in PV=nRT? I've seen two different values and don't know which is which.

Yes, you are correct that there are two values for R. The difference between these values are the units that are used. This means that you need to be very careful when you are using the ideal gas law in order to make sure that you are using the correct units.
For example, R= 8.314 J/(Kmol) and .008206 L(atm)/(Kmol) and 0.008314 L(bar)/(Kmol) and 62 L(Torr)/(Kmol).

Use the gas constant that will cancel with the units that you were given in the problem. For example, if you were given pressure in atm, use .008206 L(atm)/(Kmol). If you were given a pressure in Pa (which you could easily convert to Bars) use 0.008314 L(bar)/(Kmol)

[Amy Kumar 1I]

The R values are constant and change based on the units of pressure being used.

[Kallista McCarty 1C]

The R value will be given on the constant and equations sheet on the test! I know that there are different units that you use depending on the question, but they will both be given

[205405339]

R can have different values depending on what units are needed for the equation

[Robin Cadd 1D]

Look at the units of pressure to differentiate between the R constants. Whichever R constant contains the same units of pressure as the data you have is the one you should choose to make further calculations.

[Eunice Nguyen 4I]

R value is a constant and is chosen based on which unit is given in the problem. Make sure to keep an eye out for the unit so that you know which R value to use!