Student measured the absorbance of the substance x depending on its concentration in solution. she used 0.2 cm cuvette. her calibration curve is a straight line with the slope 2.3-103 m1. the extinction coefficient of substance x in this solution is: 4.6-10-2 m-1.cm not enough data to determine the extinction coefficient: wavelength is required o1.2.104 m: 1. cm1 o2.3-103 m: 1 not enough data to determine the extinction coefficient: concentration is required

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally