Ergosterol, a precursor of vitamin d, has δmax = 282 nm and molar absorptivity ε = 11,900 m-1cm-1. what is the concentration of ergosterol in a solution whose absorbance a = 0.43 with a sample pathlength l = 1.00 cm.?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.