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I think it will most likely by R=8.314 J/(Kmol) because that is what Lavelle gave on the formula/constant sheets in 14A. In general just look at the units to figure out what to use, or to see if you need to manipulate the constant.
DesireBrown1J wrote:What exactly is the ideal gas constant in R? When I looked it up, I realized that there are two different ones to use. How do we determine which one to use based on what information is given to us in a problem?
the way to determine which constant to use would be to look at the units and find which one matches! for example, if pressure is in pascals you would use the constant associated with that, or if it were in atm then you would use that one.
You don't have to worry too much though about which one of the R constant values to use, because (like everyone else said) the units will match up to the one we're supposed to use. So if you end up plugging in one of the other R values to the equation, not all of the units will cancel out and your answer will have some strange blend of every unit on the sheet. At least for me, that makes it pretty obvious that I chose the wrong one and have to go back a little.
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