Q14-14P If pure vitamin A has聽位max =5 ... [FREE SOLUTION]

Chapter 14: Q14-14P (page 441)

If pure vitamin A has $位_{\max}$ =5 325 ( $蔚$ = 50,100), what is the vitamin A concentration in a sample whose absorbance at 325 nm is A = 0.735 in a cell with a path length of 1.00 cm?

Short Answer

Expert verified

The concentration of vitamin A is ${1.47脳10}^{-5} 鈥塎$ .

Step by step solution

Step-by-Step Solution Step 1:Molar Absorptivity

Molar absorptivity, also known as the molar extension coefficient represented by $" 蔚 "$ , is used to measure a wavelength's absorption intensity or efficiency.

Unit of Molar absorptivity is $" L 鈥嬧赌� {mol}^{- 1} 鈥� {cm}^{- 1} "$ .

Calculation of vitamin A concentration

The formula to calculate the concentration of vitamin A is as follows:

$c= \frac{A}{蔚脳濒}$

Here:

Molar absorptivity $(蔚)$ is ${5.01脳10}^{4} 鈥塋/尘辞濒鈰� cm$
Absorbance (A) is 0.735
The sample pathlength is 1.00 cm

The known value is substituted as:

$\begin{array}{l} c= \frac{0.735}{{5.01脳10}^{4} 鈥夆赌婰/尘辞濒脳肠尘脳1.00鈥塩尘} \\ {=1.47脳10}^{-5} 鈥塎 \end{array}$

Thus the concentration of vitamin A is ${1.47脳10}^{-5} 鈥塎$

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If pure vitamin A has $位_{\max}$ =5 325 ( $蔚$ = 50,100), what is the vitamin A concentration in a sample whose absorbance at 325 nm is A = 0.735 in a cell with a path length of 1.00 cm?

Short Answer

Step by step solution

Step-by-Step Solution Step 1:Molar Absorptivity

Calculation of vitamin A concentration

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91影视

If pure vitamin A has位max =5 325 (蔚= 50,100), what is the vitamin A concentration in a sample whose absorbance at 325 nm is A = 0.735 in a cell with a path length of 1.00 cm?

Short Answer

Step by step solution

Step-by-Step Solution Step 1:Molar Absorptivity

Calculation of vitamin A concentration

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Nuclear Chemistry

Physical Chemistry

Kinetics

Chemical Analysis

Chemical Reactions

Study anywhere. Anytime. Across all devices.

If pure vitamin A has $位_{\max}$ =5 325 ( $蔚$ = 50,100), what is the vitamin A concentration in a sample whose absorbance at 325 nm is A = 0.735 in a cell with a path length of 1.00 cm?