What is the absorbance if the % transmittance is 53%? Keep 2 sig figs for the an

Question

What is the absorbance if the % transmittance is 53%? Keep 2 sig figs for the answer.

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Question 3 1 pts

The Total Cereal has a Fe concentration of 0.6 g Fe per g of Cereal. However, it is very common for students to get less than 0.6. Which of the following can be contributors to this lower experimental result than the manufacturer listed value? There are three correct answers and find all of them.

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Question 4 1 pts

A=ebc, where A is absorbance, which is unit-less, b is path length that is 1 cm for the cuvette used. If the concentration c uses mol/L, what unit should the extinction coefficient e have?

Explanation / Answer

1. A =2-log (%T)= 2-log (53)= 0.2757

2,Some Fe was lost during a few transfers between glassware

Complexing agent was occupied by excess amount of H+ and did not have a chance to complex with Fe

Under-digestion of cereal sample

3. Since A= ebC, e= A/bC, A is dimensionless and C is concentration in Moles/Liter, M and b is path length.

Hence units of e, molar extinction coefficient = 1/M.cm= Liter/mole.cm ( c is correct)

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