Find units of Do 1987 and express equation D in terms of in2

Find units of Do, 1.987 and express equation D in terms of in^2/s where T is in Rankin and E in Btu/(pounds*mol)

Solution

As D_o is directly proportional to D and exp is a constant function ( unitless) so the units of D_o are the same as of D

cm²/sec