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
Zielflug [23.3K]
3 years ago
9

Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode

in an electrolytic cell. How many hours will it take to plate 13.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 30.0 A ? Assume the chromium in the electrolytic solution is present as Cr 3 +.
Chemistry
1 answer:
mylen [45]3 years ago
3 0

Answer:

696 h

Explanation:

Let's consider the reduction of Cr³⁺.

Cr³⁺(aq) + 3e⁻ → Cr(s)

We can establish the following relations.

  • The molar mass of Cr is 52.0 g/mol.
  • 1 mol of Cr is deposited when 3 moles of e⁻ circulate.
  • 1 mole of e⁻ has a charge of 96468 c (Faraday's constant).
  • 1 A = 1 c/s
  • 1 h = 3600 s

<em>How many hours will it take to plate 13.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 30.0 A?</em>

13.5 \times 10^{3} gCr.\frac{1molCr}{52.0gCr} .\frac{3mol/e^{-} }{1molCr} .\frac{96468c}{1mol/e^{-}} .\frac{1s}{30.0c} .\frac{1h}{3600s} =696 h

You might be interested in
HELP ME THE WHOLE PAGE !!!! Someone help please
Deffense [45]

Answer:

In the image below

Explanation:

Hope this helps you :)

7 0
3 years ago
If an unknown element didplays many extremly strong metallic properties, where is it most likely to be located on the periodic t
Ipatiy [6.2K]

This is late but for anyone else who needs it...It's D. Far left

4 0
3 years ago
How do you find the value of 3A+6|C|?
Andrei [34K]

Answer:

tanong po sa ipis

Explanation:

because of the gravity of the earth

4 0
3 years ago
How many half-lives will pass by the time 1.56% of I-131 is present? B. Approximately how many days does that equal? *
serg [7]

Answer: Hmmmmm that's crazy....

There are a couple of equations one could use for this type of problem, but I find the following to be the easiest to use and to understand.

Fraction remaining (FR) = 0.5n

n = number of half lives that have elapsed

In this problem, we need to find n and are given the FR, which is 1.56% or 0.0156 (as a fraction).

0.0156 = 0.5n

log 0.0156 = n log 0.5

-1.81 = -0.301 n

n = 6.0 half lives have elapsed

Explanation:

Just wanted to help. Hopefully it's correct wouldn't want to waster your time ;)

6 0
3 years ago
What was one idea Dalton taught about atoms
gogolik [260]

The main points of Dalton's atomic theory, as it eventually developed, are: Elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass and other properties; atoms of different elements differ in size, mass and other properties.

4 0
3 years ago
Read 2 more answers
Other questions:
  • Is a electron found in a subtonic particles in a atomic nucleus
    13·1 answer
  • "the substances that are formed by a chemical change are called the" "the state of matter in which a material has a definite vol
    8·1 answer
  • The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is ________.
    6·1 answer
  • Is carbon dioxide a pure substance
    9·1 answer
  • Which of Newton's Laws describes the relationship between the mass
    8·1 answer
  • PLS ANSWER I WILL GIVE BRAINLY TO First!!!
    15·1 answer
  • What is The particle in the nucleus of an atom that has the same mass of protons but no net charge
    12·1 answer
  • The respiratory system is what brings in food and breaks it down True or false
    8·1 answer
  • Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left a
    14·2 answers
  • What properties of water are related to Oxidation?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!