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These two numbers are different forms of the gas constant and would be given to you on the exam. They are also on the sheet of equations on the back of the periodic table given to you when you bought your course reader.
Yes it has to do with the units. There is a list of four equivalent gas constants on the back of the periodic table, use the one with the proper units, in the case of 8.9 I believe that it is 8.206x10^(-2) L.atm/K/mol
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