a.) The molar absorption coefficient of a substance dissolved in benzene is measured to be 802 L mol-1 cm-1 at 492 nm. Calculate what fraction of the incident light intensity of that wavelength passes through 2.97 mm of a solution of concentration 3.06 mmol/L.b.) The molar absorption coefficient of a solute at 524 nm is 103 dm3 mol-1 cm-1. When light of that wavelength passes through a 4.70 mm cell containing a solution of the solute, 59.4 per cent of the light was absorbed. What is the concentration of the solution?Ans = ______ mmol dm-3

Question
Asked Nov 22, 2019
10 views

a.) The molar absorption coefficient of a substance dissolved in benzene is measured to be 802 L mol-1 cm-1 at 492 nm. Calculate what fraction of the incident light intensity of that wavelength passes through 2.97 mm of a solution of concentration 3.06 mmol/L.

b.) The molar absorption coefficient of a solute at 524 nm is 103 dm3 mol-1 cm-1. When light of that wavelength passes through a 4.70 mm cell containing a solution of the solute, 59.4 per cent of the light was absorbed. What is the concentration of the solution?
Ans = ______ mmol dm-3

check_circle

Expert Answer

Step 1

The term absorbance refers to the measure of the quantity of light which has been absorbed by the sample.

Step 2

According to the Beer Lambert law, the absorbance of a given solution is directly proportional to the concentration and the pathlength of the sample. The mathematical formula is given as follows:

A= e Cl
e is the molar absorptivity
C is the concentration of the sample
is the path length of the sample
A is the absorbance of the sample
help_outline

Image Transcriptionclose

A= e Cl e is the molar absorptivity C is the concentration of the sample is the path length of the sample A is the absorbance of the sample

fullscreen
Step 3

The path length of the solution in the given problem is given to be 2.97 mm=0.297 cm.

The molar absorptivity of the sample of benzene is given to be 802 L mol-1cm-1.

The c...

A e Cl
=802 L mol cm1x0.00306 mol/L x 0.297 cm
0.728
help_outline

Image Transcriptionclose

A e Cl =802 L mol cm1x0.00306 mol/L x 0.297 cm 0.728

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Physical Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: Using Hess's Law and the net ionic equations for the reaction between reaction B: Mg + 2HCl and reac...

A: The net ionic equation for part B is as follows:

question_answer

Q: Asked Nov 20, 2019 To make the solution, you will add 50g of glucose and 9 grams of NaCl to 1L DI ...

A: Click to see the answer

question_answer

Q: A 50.0 g sample of solid copper is heated from 25.0 o C to 2000.0 o C, melting it in the process. Us...

A: Heat capacity is a physical property of matter, defined as the amount of heat supplied to a given ma...

question_answer

Q: Find the specific heat capacity of gold if 108 J of energy raises the temperature of 9.0 g from 0°C ...

A: Specific heat capacity can be calculated using by the following equation.

question_answer

Q: C(s) + O2(g) -> CO2(g) CH4(g) -> C(s) + 2 H2(g) ∆Hrxn= +74.6 kJ/mol H2(g) + ½ O2(g) ->H2O(l...

A: The given reactions are

question_answer

Q: Dichloromethane (CH2Cl2, Hvap= 25 kj/mol) has a vapor pressure of 330 mm Hg at 20oC. What is the nor...

A: Given,ΔH = 25 kj/molP2 = 330 mm Hg

question_answer

Q: When 2.63 g of a polypeptide is dissolved in 101 mL of water, the resulting solution is found to hav...

A: Given information:Mass of polypeptide = 2.63 gVolume of water = 101 mLOsmotic pressure = 0.125 atmTe...

question_answer

Q: When 0.2490 moles of methane, CH4(g) is burned in excess oxygen at thermodynamic standard state, 221...

A: 0.2490 moles of methane releases 221.74kJ, then1 mol of methane releases ‘x’

question_answer

Q: Be sure to answer all parts. Use the table to calculate ΔG for the following reactions at 25°C.   ...

A: (a)ΔG for the given reaction at 25°C is calculated as follows,