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igor_vitrenko [27]
3 years ago
13

You have a solution of unknown concentration. You place this solution in your spectrometer and measure that it has an absorbance

of 0.4 at 450 nm. The molar absorptivity of your product is 1500 L/moles·cm. Assuming that you are measuring the sample in a 1 cm path length cell what is the concentration of product in your solution? Report your answer in mM units.
Chemistry
1 answer:
Vaselesa [24]3 years ago
5 0

Answer:

Concentration of solution is 0.27 mM

Explanation:

We apply Lambert-Beer law to solve this problem of spectrometry:

Abs = a . L . C

where a is absorptivity, L is the length of the cuvette and C, concentration (M).

Abs is the absorbance of the solution which is readed by the spectrometer

0.4 = 1500 L/mol.cm . 1cm . C

0.4 / 1500 mol/L = C

2.67×10⁻⁴ mol/L = C

To convert the units to mM, we need to make this conversion

2.67×10⁻⁴ mol . 1000 mmoles/ 1 mol = 0.27 mM

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3 years ago
A gas exerts a pressure of 0.62 atm. Convert this to kPa and mmHg. Be sure to show your work.
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Answer:

The answer to your question is 0.62 atm = 62.82 kPa = 471.2 mmHg

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Data

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                   0.62 atm ------------  x

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