Kool-aid contains allura red dye. a student makes a kool-aid solution by diluting 61.2 mg of kool-aid with water to a total volume of 25.00 ml using a volumetric flask. because this solution is too concentrated (measured absorbance > 1.0), the student then dilutes a small sample of the kool-aid solution by taking 0.500 ml of the solution and mixing it with 0.500 ml of water (a ½ dilution). the absorbance of the ½ diluted solution is 0.315. using the beer’s law curve, determine the concentration of the dye in the original kool-aid.

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