What is the change in Enthalpy when 1 mol of Argon is cooled from 475 K to 233 K. Given That : Molar Heat Capacity of Argon (g) = 20.8 J/K mol

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.