Question: Changing the standard unit to Joules per kilogram times Kelvin.

When I'm doing math more complicated, than in the first line, Maple gives the incorrect type of unit.
I want the unit as displayed in the first line, but by using the math/syntax shown in the last line.

Maple does not have "Joule per kilogram times kelvin", as a choosable option when I do the syntax in the last line. 

Is there any way I can end up with the correct unit, even tho I am using syntaxes?
In theory, I should end up with the same answer as a result?.

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