For the method of standard addition, it is known that 1. the ethanol concentration of the standard addition solution you prepare needs to be at least 10% to yield a detectable Raman signal,
2. adding pure ethanol to the liquor sample will increase the ethanol content by up to 100%,
3. after adding water, the final volume should be 5.00 ml.
Tabulate the volumes of liquor and pure ethanol you need for each of the five standard addition solution you need to prepare.
"For standard addition method, prepare the solutions in 5.00 mL volumetric flasks. Mix well and pipette into glass vials. Avoid evaporation and take Raman spectrum of all 5 solutions. Repeat the above dilution and measurement with Gin and Vodka in the same way. Reuse the volumetric flasks after thoroughly rinsing with water."

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?