1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Degger [83]
3 years ago
15

A 3.96x10^-24 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvet; a blank solution containi

ng only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
Chemistry
1 answer:
viktelen [127]3 years ago
4 0

Actual question from source:-

A 3.96x10-4 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000 cm cuvette.  A blank had an absorbance of 0.029.  The absorbance of an unknown solution of compound A was 0.375.  Find the concentration of A in the unknown.

Answer:

Molar absorptivity of compound A = 1502.53\ {Ms}^{-1}

Explanation:

According to the Lambert's Beer law:-

A=\epsilon l c

Where, A is the absorbance

 l is the path length  

\epsilon is the molar absorptivity

c is the concentration.  

Given that:-

c = 3.96\times 10^{-4}\ M

Path length = 1.000 cm

Absorbance observed = 0.624

Absorbance blank = 0.029

A = 0.624 - 0.029 = 0.595

So, applying the values in the Lambert Beer's law as shown below:-

0.595=\epsilon\times 1.000\ cm\times 3.96\times 10^{-4}\ M

\epsilon=\frac{0.595}{3.96\times 10^{-4}}\ {Ms}^{-1}=1502.53\ {Ms}^{-1}

<u>Molar absorptivity of compound A = 1502.53\ {Ms}^{-1}</u>

You might be interested in
Which property of potential energy distinguishes it from kinetic energy?
vazorg [7]

Answer: <u><em>Shape and position</em></u>

Explanation:

<u><em>I just took the test and I got it correct</em></u>

3 0
3 years ago
Which statement best describes the process that the diagrams show?
TEA [102]

B. This looks like ice turning to water then to steam

7 0
3 years ago
Read 2 more answers
What is the first step in replication
levacccp [35]
<span>the first major step for the dan replication to take place is the breaking of hydrogen bonds between bases of the two antiparallel strands </span>
4 0
3 years ago
After attending his cousin's birthday party in his backyard, Michael forgot his balloon outside when he went to bed. Overnight,
Vitek1552 [10]

Answer:

See explanation

Explanation:

You see, we must cast our minds back to Charles' law. Charles' law gives the relationship between the volume of a gas and temperature of the gas.

Now, Micheal left the balloon outside at a particular temperature and volume the previous night. Overnight, the temperature dropped significantly and so must the volume of the gas in the balloon!

Remember that Charles' law states that, the volume of a given mass of gas is directly proportional to its absolute temperature at constant pressure. Since the pressure was held constant, the drop in the volume of gas in the balloon can be accounted for by the drop in temperature overnight.

5 0
2 years ago
WILL GIVE YOU BRAINLIEST!!!
Papessa [141]

Answer:

A ability to decompose

B reactivity

Explanation:

Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances.

Examples are flammability, rusting of iron, precipitation, decomposition of water by an electric current.

The ability to decompose and reactivity are chemical properties of a substance.

  • Physical properties tells us everything about what a substance is when no change is occurring to its constituents.
  • Examples are state of matter, color, odor, taste, texture, hardness e.t.c

5 0
3 years ago
Read 2 more answers
Other questions:
  • The density of ethanol is 0.789 g/cm3 at 20°C. What volume of ethanol has a mass of 15.5 grams?
    10·2 answers
  • Sk☺️<br> otp pt2 gt p npp l l li p put pylop lolky g hn
    7·1 answer
  • A substance is composed of one kind of atom and can’t be separated into simpler substances or converted into another substance b
    8·1 answer
  • 7. Carbon-11 has a half-life of 20 minutes. Explain what this means.
    10·1 answer
  • Which type of compound dissociates?<br><br> A.ionic<br> B.molecular<br> C.liquid<br> D.all types
    8·2 answers
  • When the surface of a mirror curves inward, like the inside of a bowl, it is called a ____.
    13·2 answers
  • What is the difference between the cells in a single-called organism and the cells in a human body
    9·1 answer
  • WILL GIVE BRANLIEST!! EASY BUT I WAS TO LAZY TO LEARN!! WILL FOREVER BE GREATFUL!!!
    10·1 answer
  • What do i do if my crush likes another girl?
    14·2 answers
  • 1. Which of the following statements pertaining to the ionic solids represented below are true?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!