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Jessica Castellanos wrote: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)
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