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
Hatshy [7]
2 years ago
5

Identify which redox reactions occur spontaneously in the forward direction. Check all that apply.

Chemistry
1 answer:
lidiya [134]2 years ago
7 0

<u>Answer:</u>

<u>For a:</u> The reaction is not spontaneous.

<u>For b:</u> The reaction is spontaneous.

<u>For c:</u> The reaction is not spontaneous.

<u>For d:</u> The reaction is spontaneous.

<u>Explanation:</u>

For the reaction to be spontaneous, the Gibbs free energy of the reaction must come out to be negative.

Relationship between standard Gibbs free energy and standard electrode potential follows:

\Delta G^o=-nFE^o_{cell}

For a reaction to be spontaneous, the standard electrode potential must be positive.

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

E^o_{cell}=E^o_{cathode}-E^o_{anode}       .......(1)

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

  • <u>For a:</u>

The chemical reaction follows:

Fe(s)+Mn^{2+}(aq.)\rightarrow Fe^{2+}(aq.)+Mn(s)

We know that:

E^o_{Fe^{2+}/Fe}=-0.44V\\E^o_{Mn^{2+}/Mn}=-1.18V

Calculating the E^o_{cell} using equation 1, we get:

E^o_{cell}=-1.18-(-0.44)=-0.74V

As, the standard electrode potential is coming out to be negative. So, the reaction is not spontaneous.

  • <u>For b:</u>

The chemical reaction follows:

Fe(s)+2Ag^{+}(aq.)\rightarrow Fe^{2+}(aq.)+2Ag(s)

We know that:

E^o_{Fe^{2+}/Fe}=-0.44V\\E^o_{Ag^{+}/Ag}=0.80V

Calculating the E^o_{cell} using equation 1, we get:

E^o_{cell}=0.80-(-0.44)=1.24V

As, the standard electrode potential is coming out to be positive. So, the reaction is spontaneous.

  • <u>For c:</u>

The chemical reaction follows:

Zn(s)+Mg^{2+}(aq.)\rightarrow Zn^{2+}(aq.)+Mg(s)

We know that:

E^o_{Zn^{2+}/Zn}=-0.76V\\E^o_{Mg^{2+}/Mg}=-2.37V

Calculating the E^o_{cell} using equation 1, we get:

E^o_{cell}=-2.37-(-0.76)=-1.61V

As, the standard electrode potential is coming out to be negative. So, the reaction is not spontaneous.

  • <u>For d:</u>

The chemical reaction follows:

2Al(s)+3Pb^{2+}(aq.)\rightarrow 2Al^{3+}(aq.)+3Pb(s)

We know that:

E^o_{Al^{3+}/Al}=-1.66V\\E^o_{Pb^{2+}/Pb}=-0.13V

Calculating the E^o_{cell} using equation 1, we get:

E^o_{cell}=-0.13-(-1.66)=1.53V

As, the standard electrode potential is coming out to be positive. So, the reaction is spontaneous.

You might be interested in
A fixed mass of a gas occupies 1000cm
Serhud [2]

Answer:

the pressure of gas is 100.0 the volume is 500.0

Explanation:

4 0
2 years ago
How many atoms in 5.01 mole of lead?
leva [86]

Answer:

30.17 × 10²³ atoms

Explanation:

Given data:

Number of moles of lead = 5.01 mol

Number of atoms = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

In given question:

1 mole = 6.022 × 10²³ atoms

5.01 mol × 6.022 × 10²³ atoms / 1 mol

30.17 × 10²³ atoms

3 0
2 years ago
In a solution, when the suspension of one kind of molecules is blended or dissolved with another, the ________ properties are no
Sidana [21]

Answer:

chemical

Explanation:

The chemical properties determine the identity of a substance and are not changed when there is no reaction. In the solution, what takes place is a physical change, which is a change of state (for example, going from solid to aqueous form).

8 0
3 years ago
Which group is the most reactive?
RideAnS [48]

Answer:

alkali metals- Group 1

Explanation:

they have less valence electrons and therefore are more reactive

8 0
3 years ago
All energy originates from the _______.
Phantasy [73]

Answer:

sun

Explanation:

because all plants use energy from the sun to make food and grow

7 0
3 years ago
Read 2 more answers
Other questions:
  • What does the state symbol ecu mean when written after a chemical compounds in a chemical equation
    15·1 answer
  • Name two fluid technologies that make use of air
    13·2 answers
  • 1) What is the mole ratio of D to A in the generic chemical reaction? (2 points) Page 390 helps with understanding mole ratios.
    11·1 answer
  • What components of an endothermic reaction have a higher heat content
    15·1 answer
  • In an atom, electrons
    9·1 answer
  • HELP!!! What two volume units have the same value?
    12·2 answers
  • 1. Which answer best describes this reaction?
    9·1 answer
  • Help me answer this please
    15·1 answer
  • jason and manuel wanted to separate sand from water in the space provided draw the set up required to obtain water from such a m
    14·1 answer
  • What would be the vital capacity be for a man that has a tidal volume of 500mL, a residual volume of 1100 mL, an expiratory rese
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!