Describe the property of each material (ex., thickness, reflectivity, color, etc.) and how those properties optimize the transfer of thermal energy into the oven and the s'more. Explain how the properties of the materials and overall design minimize loss of thermal energy to the surroundings.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.