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MissTica
3 years ago
13

The free energy change for the following reaction at 25 °C, when [Cr3+] = 1.32×10-3 M and [Fe3+] = 1.14 M, is 131 kJ: Cr3+(1.32×

10-3 M) + Fe2+(aq) Cr2+(aq) + Fe3+(1.14 M) ΔG = 131 kJ What is the cell potential for the reaction as written under these conditions? Answer: V Would this reaction be spontaneous in the forward or the reverse direction?
Chemistry
1 answer:
larisa [96]3 years ago
6 0

Answer:

E°cell = - 1.3575 V

This reaction is spontaneous in the reverse direction

Explanation:

The given cell reaction:

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

The given Gibbs free energy: ΔG = 131 kJ = 131 × 10³ J     (∵ 1 kJ = 10³ J)

As we know,

ΔG = - n F E°cell

Here, n - the number of moles of electrons transferred = 1

F - Faraday constant = 96500

E°cell - cell potential = ?

\therefore E^{\circ }_{cell} = -\frac{\Delta G}{n \: F} = -\frac{131\times 10^{3}\, J}{1\, mol\times96500 \, C.mol^{-1}}

\Rightarrow E^{\circ }_{cell} = -1.3575\, V

<u>For a given chemical reaction if-</u>

1. ΔG = negative and E°cell = positive

⇒ <em>The reaction is spontaneous and proceeds spontaneously in the forward direction.</em>

2.  ΔG = positive and E°cell = negative

⇒ <em>The reaction is non-spontaneous and proceeds spontaneously in the reverse direction.</em>

<u>Since, for this chemical reaction: </u>

Cr³⁺(1.32 × 10⁻³ M) + Fe²⁺(aq) → Cr²⁺(aq) + Fe³⁺(1.14 M)

ΔG = + 131 × 10³ J ⇒ positive

and, E°cell = - 1.3575 V ⇒ negative

<u>Therefore, this reaction is spontaneous in the reverse direction.</u>

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<h2>4. Na+ diffusing toward the side of the membrane with Cl− and 50% less Na+.</h2>

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1. Which two particles are found in the nucleus of an atom?
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1. C
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The proton and the neutron are located in the central part of the atom, which is called the nucleus while the electrons orbit around the nucleus. The electron is negatively charged, the proton is positively charged and the neutron does not have any charge.

2. C.
To calculate the average atomic mass of the element, divide the percentage abundance by 100 and then multiply the mass and the abundance value together for each element. After this add all the values obtained together.
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3. A particle that orbit the nucleus is called AN ELECTRON.
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4. C.
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5. D.
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6. B.
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7. B.
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8. D.
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9. D.
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10. B.
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Answer:

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Hope this helps, have a great day!

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