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To know which value of R to use, make sure you read the problem that you are doing carefully. It should give you context clues as to whether you are dealing with atms, bars, etc. Then you would use the R value for the specific unit.
if you're worried that different units will be on the test for constant R, don't worry! on the constants and equations sheet that we are allowed to use during tests, Dr. Lavelle put the value of R for many different units! you can find the sheet on the 14b website :)
In order to figure out which correct R value to use, you would simply look at the units given within the question. Technically, you can use any R value as long as you convert the given units in the question to match the units on the R value that you choose, but there's no reason to go through all that extra work when we are already given different R values on the constants sheet that correspond to the appropriate units.
Like the comments said before, you will most likely use the standard R constant 8.206 x 10^-2. However if you have the other variables to solve for R or have different units, you would reevaluate how you find R. I don't think we have to worry too much about R in general.
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