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
Nesterboy [21]
3 years ago
13

A specific steroid has a λmax of 257 nm and a molar absorptivity ε of 11 , 500 L mol − 1 cm − 1 . What is the concentration of t

he compound in a solution whose absorbance at 257 nm is A = 0.090 with a sample pathlength of 1.00 cm ?
Chemistry
1 answer:
joja [24]3 years ago
6 0

Answer:

7.83\times 10^{-6} M is the concentration of the compound in a solution.

Explanation:

Using Beer-Lambert's law :

Formula used :

A=\epsilon \times C\times l

Where:

A = absorbance of solution

C = concentration of solution

l = path length

\epsilon = molar absorptivity coefficient

We have:

C = ? , l = 1.00 cm, A = 0.090

\epsilon = 11,500 L/(mol cm)

C=\frac{A}{\epsilon l}=\frac{0.090}{11,500 L/(mol cm)\times 1.00 cm}

C=7.83\times 10^{-6} M

7.83\times 10^{-6} M is the concentration of the compound in a solution.

You might be interested in
What is the mass of silver chloride.required to plate 295mg.of pure.silver
vekshin1


17 hope its correct pls rate 5 star


3 0
2 years ago
How many molecules of O2 are present in a 3.90L flask at a temperature of 273K and a pressure of 1.00atm?
Lisa [10]

Based on the ideal gas relation:

PV = nRT

where P = pressure ; V = volume ; T = temperature

n = number of moles; R = gas constant = 0.0821 L atm/mol-K

Step 1: Find the number of moles of O2

n = PV/RT = 1 * 3.90/0.0821*273 = 0.1740 moles

Step 2: Calculate the molecules of O2

Now, 1 mole of O2 corresponds to 6.023 * 10²³ molecules of O2

Therefore, 0.1740 moles of O2 corresponds to-

0.1740 moles of O2 * 6.023*10²³ molecules of O2/1 mole of O2

= 1.048 * 10²³ molecules of O2

4 0
2 years ago
Read 2 more answers
Please answer fast if can, will give Brainiest
Vilka [71]

From the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains (option D).

<h3>What is the absorption spectra?</h3>

The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.

Thus, from the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains.

Learn more about absorption spectra:brainly.com/question/4239971

#SPJ1

7 0
2 years ago
Which of the following is NOT an example of a molecule <br> A: H2O2<br> B:NCI3<br> C:F<br> D:O3
timama [110]

C. F because it's an atom not a molecule

6 0
3 years ago
Read 2 more answers
How does a lightning rod protect a<br> building from lightning damage?
LiRa [457]

Answer:

The lightning rod attracts lightning and is not connected to any other pieces of metal that may harm any electrical circuits.

Explanation:

I hope this helps, I tried my best to explain it quickly for you.

7 0
2 years ago
Read 2 more answers
Other questions:
  • The aromatic hydrocarbon cymene (C10H14) is found in nearly 100 spices and fragrances including coriander, anise, and thyme. The
    15·1 answer
  • Look at the reaction below.
    8·2 answers
  • Calculate the mass of 139 cm^3 Argon at STP
    6·1 answer
  • How many moles are in 345g of Re
    11·1 answer
  • 3CI02+NO_3-+H_2O--&gt; NO +3CIO3-+2H+In the above redox reaction, use oxidation numbers to identify the element oxidized, the el
    15·1 answer
  • Element A has an electronegativity of 2.20. Element B has an electronegativity of 3.44. The bond of molecule AB is then best des
    11·2 answers
  • How many moles of calcium hydroxide are needed to produce 73.7 milliliters of water, if the density of water is 0.987 g/mL? Show
    9·1 answer
  • V _ionic or compound
    8·1 answer
  • Doc. No.
    7·1 answer
  • Which of the following ions is formed when a base is dissolved in a solution?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!