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
Eva8 [605]
2 years ago
12

What is the calculated value of the cell potential at 298K for an

Chemistry
1 answer:
Tpy6a [65]2 years ago
4 0

The question is incomplete, here is the complete question:

What is the calculated value of the cell potential at 298 K for an  electrochemical cell with the following reaction, when the H₂  pressure is 6.56 x 10⁻² atm, the H⁺ concentration is 1.39 M, and  the Sn²⁺ concentration is 9.35 x 10⁻⁴ M?

2H^+(aq)+Sn(s)\rightarrow H_2(g)+Sn^{2+}(aq)

<u>Answer:</u> The cell potential of the given electrochemical cell is 0.273 V

<u>Explanation:</u>

For the given chemical equation:

2H^+(aq)+Sn(s)\rightarrow H_2(g)+Sn^{2+}(aq)

The half cell reactions for the given equation follows:

<u>Oxidation half reaction:</u> Sn(s)\rightarrow Sn^{2+}(aq)+2e^-;E^o_{Sn^{2+}/Sn}=-0.14V

<u>Reduction half reaction:</u> H_2+2e^-\rightarrow H_2(g);E^o_{2H^{+}/H_2}=0.0V

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

To calculate the E^o_{cell} of the reaction, we use the equation:

E^o_{cell}=E^o_{cathode}-E^o_{anode}

Putting values in above equation, we get:

E^o_{cell}=0.0-(-0.14)=0.14V

To calculate the EMF of the cell, we use the Nernst equation, which is:

E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Sn^{2+}]\times p_{H_2}}{[H^+]^2}

where,

E_{cell} = electrode potential of the cell = ?

E^o_{cell} = standard electrode potential of the cell = +0.14 V

n = number of electrons exchanged = 2

[H^{+}]=1.39M

[Sn^{2+}]=9.35\times 10^{-4}M

p_{H_2}=6.56\times 10^{-2}atm

Putting values in above equation, we get:

E_{cell}=0.14-\frac{0.059}{2}\times \log(\frac{(9.35\times 10^{-4})\times (6.56\times 10^{-2})}{(1.39)^2})\\\\E_{cell}=0.273V

Hence, the cell potential of the given electrochemical cell is 0.273 V

You might be interested in
How many neutrons would be in an atom of Selenium if the mass number for this particular isotope is Se-80?
EleoNora [17]

Answer:2

Explanation:

6 0
2 years ago
Which best describes two ways in which hydrogen is involved in photosynthesis?
sveticcg [70]

Answer:

C

Explanation:

Just took the test

4 0
3 years ago
Read 2 more answers
What is the theoretical yield of aspirin ( C 9 H 8 O 4 ), which has a molar mass of 180.15 g/mol, possible when reacting 3.03 g
pantera1 [17]

Answer:

The theoretical yield of aspirin is 3.95 grams

Explanation:

Step 1: Data given

Mass of salicylic acid = 3.03 grams

Volume of acetic anhydride = 3.61 mL

Density of acetic anhydride = 1.08 g/cm³

Step 2: The balanced equation

C4H6O3+C7H6O3→C9H8O4+C2H4O2

Step 3: Calculate moles salicylic acid

Moles salicylic acid = mass salicylic acid / molar mass salicylic acid

Moles salicylic acid = 3.03 grams /138.121 g/mol

Moles salicylic acid = 0.0219 moles

Step 4: Calculate mass acetic anhydride

Mass acetic anhydride = volume * density

Mass acetic anhydride = 3.61 mL * 1.08 g/mL

Mass acetic anhydride = 3.90 grams

Step 5: Calculate moles acetic anhydride

Moles acetic anhydride = 3.90 grams / 102.09 g/mol

Moles acetic anhydride = 0.0382 moles

Step 6: Calculate limiting reactant

For 1 mol salicylic acid we need 1 mol acetic anhydride to produce 1 mol aspirin

Salicylic acid is the limiting reactant. It will completely be consumed. (0.0219 moles). Acetic anhydride is in excess. There will react 0.0219 moles. There remain 0.0382 - 0.0219 =0.0163 moles

Step 7: Calculate moles aspirin

For 1 mol salicylic acid we need 1 mol acetic anhydride to produce 1 mol aspirin

For 0.0219 moles salicylic acid we'll have 0.0219 moles aspirin

Step 8: Calculate theoretical yield of aspirin

Mass of aspirin = moles aspirin *molar mass aspirin

Mass of aspirin = 0.0219 moles *180.15 g/mol

Mass of aspirin = 3.95 grams

The theoretical yield of aspirin is 3.95 grams

7 0
3 years ago
Can somebody please help with this question?
Leni [432]
Most of the mass of an atom is located in the (nucleus), and most of the volume is taken up by the (electron clouds).

The ones in the parenthesis are your answers.

Hope this helps!
7 0
3 years ago
You have at your disposal 3 1-pound bags of various pure salts that dissolve readily in water. You can add one of the bags to a
Sedaia [141]

Answer:

This question appears incomplete

Explanation:

However, it should be noted that addition of soluble salts generally lowers the freezing point of water hence after the addition, water will no longer freeze at 0°C but lower.

Soluble salts tend to form more ions in water, it is these ions that are responsible for interfering with the hydrogen bonds hence lowering the freezing. Thus, (since each bag are of the same weight) <u>the bag that contains the salt that ionizes more in water will lower the freezing point by the greatest amount</u>.

NOTE: Different weight of the salts could lead to more ions been formed in the water by some salts as against the other.

6 0
3 years ago
Other questions:
  • Nacl is an ionic solid. the na+ and cl− ions in nacl are bonded through an electrostatic force of attraction commonly known as t
    9·2 answers
  • What is one of the products produced when al(no3)3 and cao react together? alo2 cano3 al2o3 ca(no3)3?
    8·2 answers
  • how will the following systems react when an increase in pressure occurs? note all species are gases N2O4&lt;--&gt;2NO2
    15·1 answer
  • 22.What percent would be dominant? What percent would be recessive?
    9·2 answers
  • Which of the following is made up of only one type of atom? 1) NO 2) He 3)CO 4)MgS
    8·1 answer
  • Anthracite is so hard and pure it is also referred to as a _____.
    10·1 answer
  • The decomposition of HI(g) is a second order reaction.
    13·1 answer
  • Granite forms as magma cools in large underground chambers. After a very long time, the magma cools enough to crystallize into s
    12·1 answer
  • 1. How many joules of heat are necessary to melt 500 g of ice at its freezing point?
    6·1 answer
  • What is a technique for gene therapy?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!