Based on the following table, which compound might have a yellow color? B All wo

Question

Based on the following table, which compound might have a yellow color? B All would be colorless A Both C and D D C What is the concentration of a solution of a plant pigment (c = 37, 500) if an absorbance of 0.751 were obtained in a cell with a 5.00 cm path length? 4.00 times 10^-4 M 2.00 times 10^-5 M 2.67 times 10^-5 M 1.78 times 10^-4 M Consider the following data for a series of hypothetical plant pigments. The Absorbance of a 3.25 times 10^-5 M solution containing one of these pigments, measured in a 1.00 cm cell, was 0.345. Which pigment was in the solution? QT7 XR4 B78 L99 Based on the following table, in which compound is the energy difference between the HOMO and LUM the largest?

Explanation / Answer

15)

we know that

the visible light ranges froom 390-700 nm

so

from the given compounds

only C falls into this category

so

the answer is f) C

16)

we know that

according to Beers law

A = e x l x c

given

A = 0.751

e = 37500

l = 5

so using those values

we get

0.751 = 37500 x 5 x c

c = 4 x 10-6

so

the concentration of the solution is 4 x 10-6 M

so

the answer is a) 4 x 10-6 M

17)

now

A = e x l x c

using given values

we get

0.345 = e x l x 3.25 x 10-5

e = 10615

so

from the given table

we can see that

the pigment in the solution is L99

so

the answer is d) L99

18)

we know that

E = hc / lamda

so

lower the lamda , higher the energy

so looking at the table

we can see that

W has the lowest lamda value , so higher the energy difference

so

the answer is compound W

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