The specific heat per unit mole of a particular ideal gas can be approximated between two temperatures of interest, t1, and t2. using the polynomial curve fit; cp = at^3 +b consider a process in which this gas starts at t1, and p1, and ends at t2, and p2. provide the appropriate mathematical expressions (in terms of a, b, t1, t2, p1, p2, and r, where r is the universal gas constant) which accounts for this variation in specific heat and calculates the a)- change in enthalpy per unit mole b)- change in entropy per unit mole

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w