Sorry for such question, I don't know where to ask about this but I hope you can help me. How to convert J/mol-K to BTU/mol-R? Example 8.314 J/mol-K to BTU/mol-R? What I know is that 1 BTU = 1056 Joules and that Kelvin = 1.8 Rankine. So: (8.314 J/mol-K)(1 BTU/1056 J)(1 K/ 1.8 R) = 4.3739 x 10^-3 BTU /mol-R. But the answer is supposed to be 1.986. Any help would be appreciated, thank you.