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
ahrayia [7]
3 years ago
7

For the galvanic (voltaic) cell Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s) (E°= 0.77 V at 25°C), what is [Fe2+] if [Mn2+] = 0.040 M and

E = 0.78 V?
Assume T is 298 K
Chemistry
1 answer:
avanturin [10]3 years ago
7 0

Answer:

0.01836 M

Explanation:

Again the reaction equation is;

Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)

E°cell= 0.77 V

Ecell= 0.78 V

[Mn2+] = 0.040 M

[Fe2+] = the unknown

n=2

From Nernst's equation;

Ecell= E°cell- 0.0592/n log Q

0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]

0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]

0.01/ -0.0296= log [Fe2+] /[0.040]

-0.3378= log [Fe2+] /[0.040]

Antilog(-0.3378) = [Fe2+] /[0.040]

0.459= [Fe2+] /[0.040]

[Fe2+] = 0.459 × 0.040

[Fe2+] = 0.01836 M

You might be interested in
Two substances A and B, initially at different temperatures, are thermally isolated from their surroundings and allowed to come
Elden [556K]

Answer:

B

Explanation:

For solving this we need a heat balance

Q_{a} = Q_{b}\\m_{a}*C_{a}*\Delta T_{a} = m_{b}*C_{b}*\Delta T_{b}

By changing the corresponding relations, we have

m_{a}*C_{a}*\Delta T_{a} = \frac{1}{2}m_{a}*4C_{a}*\Delta T_{b} \\\\\\

By cancelling similar factor, we obtain

\Delta T_{a} = 2 \Delta T_{b}\\\frac{\Delta T_{a}}{\Delta T_{b}} = 2\\

Which means that the change of temperature in A is twice the change of B

3 0
3 years ago
Which metal can replace another metal in a reaction?
deff fn [24]

Answer:

O A. A metal higher on the activity series list will replace one that is

lower.

4 0
3 years ago
Why do sea and ocean levels recede (more coast land is exposed) when the planet goes through a major ice age?
fomenos
This happens because ice is made up of water, and when that water freezes, it never goes back to land, thus there being less water on the coastline. But when the ice starts to melt, the water will even out quickly, and the water will go to the coastline, causing the tide to rise. Mark brainliest, please.

3 0
3 years ago
And ironic bonds what happens to electrons? No
iren [92.7K]

Answer:

metals donate electrons to nonsmetals

5 0
3 years ago
During nuclear decay, if the atomic number decreases by one but the mass number is unchanged, the radiation emitted is
Artemon [7]

Answer:

A beta particle

Explanation:

The radioactive particle must undergo a beta decay to have the mass number unchanged but the atomic number to have decreased by one.

This type of beta decay results in the emission of a positron which is a type of beta particle. It resembles an electron but it has a positive charge of 1.

8 0
3 years ago
Other questions:
  • What do all four animals have in common? cat worm spider crab
    8·1 answer
  • PLEASE HELP ASAP What is the best name for this molecule? Explain your naming process.
    7·1 answer
  • Contrast molecules, compounds and ions
    8·1 answer
  • What is the average speed vavg of the molecules in the gas? express your answer numerically to three significant digits?
    6·1 answer
  • Which equation represents the oxidation half-reaction for this redox reaction?
    9·1 answer
  • 10 point + brainlyiest= 1 big thank u
    9·2 answers
  • A student heats up a metal and finds that its mass increases. The students says “this is because heat has been added.” Explain w
    7·1 answer
  • What happens to energy when methane increases?
    14·1 answer
  • Which two have to do with Movement of Galaxies? (pick 2)
    11·1 answer
  • How would the boiling point of water be affected if you doubled the amount of water?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!