A solution containing 5.24 mg/IOO mL of A (335 g.'mol) has a transmittance of55.2% in a

Chapter 13, Problem 13-6

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QUESTION:

A solution containing 5.24 mg/IOO mL of A (335 g.'mol) has a transmittance of55.2% in a 1.50-cm cell at 425 nm. Calculate the molar absorpti\'ity of A at thiswavelength.

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QUESTION:

A solution containing 5.24 mg/IOO mL of A (335 g.'mol) has a transmittance of55.2% in a 1.50-cm cell at 425 nm. Calculate the molar absorpti\'ity of A at thiswavelength.

ANSWER:

Step 1 of 3

*Mass of substance=5.24 mg/100mL=0.0524 g/L

*Number of moles of the substance=335 g/mol

The molar mass of a substance is calculated by the formula

, Where:

M is the molar mass of the solution.

m is the mass of the substance in the solution.

n is the number of moles of a substance in the solution.

Substituting in the above equation, we get

The concentration of the solution is

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