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
Gwar [14]
3 years ago
10

In the spectrophotometric analysis of benzene, the calibration curve has a slope of 195 AU/M and an intercept of 0.079 AU. If an

unknown has an absorbance of 0.517 AU, what is the concentration of benzene in the sample?
a. 2.09 x10^-4 M
b. 2.25 x 10^-3 M
c. 2.65 x 10^-3 M
d. 0.438 M
Chemistry
1 answer:
zloy xaker [14]3 years ago
5 0

Answer:

b. 2.25 x 10^-3 M

Explanation:

Please remember that according to Beer´s, law the absorbance is given by

A = Acl where A = absorbance, A is the molar absorptivity, c is concentration (M) and l is the path length of the cubette of used.

Now it follows from this equation that the absorbance is linearly related to concentration and what we are being told is that experimentally the linear equation obtained during calibration was:

A = 195 c + 0.079

We have all the information required to solve this question to solve for c:

0.517 = 195 c + 0.079 ⇒ c = (0.517 - 0.079) AU/ 195 AU/M = 2.25 x 10⁻³ M

You might be interested in
Why are animals so impportant to our lifes
ivann1987 [24]

Answer:

Animals are important because without them we wouldnt have any food

Explanation:

5 0
2 years ago
Read 2 more answers
What type of chemical bond is hydrogen?
oksian1 [2.3K]
Hydrogen is a covalent bond. (A bond where one or more pairs of electrons are shared by two atoms)

7 0
3 years ago
Why will liquids evaporate even at room temperature?
mr Goodwill [35]
<h2>It can happen when liquids are cold or when they are warm. ... It turns out that all liquids can evaporate at room temperature and normal air pressure. Evaporation happens when atoms or molecules escape from the liquid and turn into a vapor. Not all of the molecules in a liquid have the same energy.</h2>
6 0
3 years ago
Which organic compound is correctly matched with the subunit that composes it?
Alex787 [66]
It is the Starch-glucose. Glucose is a solitary sugar particle that your body can retain specifically in the digestive system. Sucrose and starches are starches shaped by at least two sugars reinforced together. The sugars in sucrose and starch must be separated into glucose particles in the gastrointestinal tract before your digestive organs can assimilate them.
7 0
3 years ago
A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element fo
melamori03 [73]

Answer:

[Cl-18]⁻ & [Cl-20]⁻

Explanation:

By definition isotopes are elements with the same number of protons by different number of neutrons. Elements X-18 & X-20 have 17 protons and represent Chlorine isotopes Cl-18 & Cl-20 each with 17 protons and 18 electrons to give the isotopes a -1 oxidation state. Both isotope of chlorine have 7 electron in its valence shell and 10 electrons in its core structure.  Gaining 1 electron fills the valence octet and establishes a -1 oxidation state.

7 0
3 years ago
Other questions:
  • How are elements arranged in the periodic table? By number or by mass?
    5·2 answers
  • What is the force caused by wind pushing on a building?
    9·1 answer
  • (Brainliest) Please Help! Please do not give me a random, gibberish answer or I will report you and give you a low rating theref
    8·1 answer
  • The molar mass of monopotassium phosphate is 136.09 g/mol. How many moles of monopotassium phosphate are needed to make 250.0 ml
    12·1 answer
  • What is the combined gas law?
    11·1 answer
  • Calculate no. Of moles in 329g of H2so4
    7·1 answer
  • when your tires heat up from driving on a hot road the pressure inside of them increase. this is an example of which gas law
    8·1 answer
  • Meiosis goes through 2 divisions to create four unique haploid cells. true or false
    14·1 answer
  • Balance the following chemical equation:<br> Mg(OH)₂ ​+ HCI → MgCI₂ ​+ H₂ ​O
    6·1 answer
  • What happends to particles in matter when matter gains heat?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!