A 4.00 x 104 M solution of aniline in H₂0 has absorbance A = 0.504 at 280 nm, when measured in a 1.00 cm cell. Find the transmittance of a 1.50 x 10-³ M solution of aniline in water when measured at the same wavelength but in a 0.500 cm cell.

The energy content of different foods can be determined by combusting samples in a calorimeter. The water in the calorimeter absorbs the heat released by the combustion. Two trials are done with two snack foods. The mass and temperature changes of the water are shown in the following table. Assume that the calorimeter is perfectly insulated and all of the heat released is absorbed by the water. Sample Mass of Snack Mass of Water AT of Water Snack X 0.20 g 200. g 6.0°C Snack Y 0.80 g 200. g 12.0°C What conclusion can be drawn about the amount of energy released per gram of snack X compared with the amount released per gram of snack Y? A Snack X released twice as much energy per gram as snack Y did. B Snack X released four times as much energy per gram as snack Y did. Snack Y released twice as much energy per gram as snack X did. Snack Y released four times as much energy per gram as snack X did. (0)

Explain the relation betwwen thermal diffusivity and thermal conductivity and why do we have two different quantities having similar meaning for heat transfer but not have for mess transfer.

Passing a beam of monochromatic light through a cell containing a colored solution absorbs 60% of the incident light. a) What is the transmittance value of the solution? b) what absorbance value does it correspond to?