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
sergiy2304 [10]
3 years ago
5

A voltaic cell utilizes the following reaction: 4Fe2+(aq)+O2(g)+4H+(aq)→4Fe3+(aq)+2H2O(l).

Chemistry
1 answer:
kari74 [83]3 years ago
8 0

Answer:

The Emf of the given cell at [Fe2+] = 2.0 M and [Fe3+] = 1.9 M is 0.48 V

Explanation:

The half cell reaction can be written as :

Anode-Half (oxidation) :

Fe^{2+}\rightarrow Fe^{3+} + 1e^{-} ......E = 0.77 V

(multiply this equation by 4 to balance the electrons)

Cathode-half (reduction)

4H^{+} +O_{2} + 4e^{-} \rightarrow 2H_{2}O....E= 1.23 V

E^{0}_{cell} = E_{cathode} - E_{anode}

E^{0}_{cell} = 1.23 - 0.77

E^{0}_{cell} = 0.46 V

According to Nernst Equation

E_{cell} = E^{0} - \frac{RT}{nF}lnQ

E_{cell} = E^{0} - \frac{0.059}{n}logQ

n = number of electron transferred in the cell reaction = 4

The balanced equation is :

4Fe^{2+} + 4H^{+} +O_{2} \rightarrow 4Fe^{3+} + 2H_{2}O

E_{cell} = 0.46 - \frac{0.059}{4}logQ

log Q = \frac{[Fe^{3+}]^{4}}{[Fe^{2+}]^{4}}

log Q = \left ( \frac{[Fe^{3+}]}{[Fe^{2+}]} \right )^{4}

log Q = \left ( \frac{1.9}{2.0} \right )^{4}

Insert the value of log Q in Nernst  Equation:

E_{cell} = 0.46 - \frac{0.059}{4} log\left ( \frac{1.9}{2.0} \right )^{4}

(using :log^{a}b = a\log b

)

E_{cell} = 0.46 - log\frac{1.9}{2.0}

E_{cell} = 0.46 - log(0.95)

E_{cell} = 0.46 -(-0.0227)

E_{cell} = 0.482 V

You might be interested in
The table shows the charge on three unknown subatomic particles.
brilliants [131]

Answer:

B. only particle Z

Explanation:

In the case of subatomic particles, those positive and neutral are located in the nucleus, and those with a negative charge on the outside.

8 0
4 years ago
Read 2 more answers
What type of bonds hold the atoms together in polyatomic ions
IRISSAK [1]
<span>This is a covalent bond, a bond in which atoms share electrons. Covalent bonding generally happens between nonmetals. Covalent bonding is the type of bond that holds together the atoms within a polyatomic ion. It takes two electrons to make a covalent bond, one from each bonding atom.

</span><span>Mark as brainlist if correct please and have a blessed day!
</span>
8 0
3 years ago
Imagine that you helped to discover a new element; A=302;Z=119. How many protons, electrons, and neutrons are in each atom it th
oee [108]

Explanation:

Given that,

Mass number, A = 302

Atomic number, Z = 119

We know that, atomic number = no of protons

Protons = 119

Mass no. = No. of neutrons + No. of protons

302 = No. of neutrons + 119

No. of neutrons = 302 - 119

= 183

No. of electrons = No. of protons

= 119

5 0
3 years ago
In the past mining companies were not made responsible for the clean-up of any of
aliya0001 [1]
D because it was abandoned
4 0
3 years ago
The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 1
Harman [31]

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

3 0
3 years ago
Other questions:
  • Attempt 3 During an experiment, a student adds 2.90 g CaO 2.90 g CaO to 400.0 mL 400.0 mL of 1.500 M HCl 1.500 M HCl . The stude
    10·1 answer
  • How would you explain the Earth’s atmosphere?
    8·1 answer
  • False answer it's F**** wrong
    11·1 answer
  • In reversible reaction when do forward reactions take place
    9·1 answer
  • PLEASE HELP ASAP I'LL GIVE BRAINLIEST: What would be the correct electron dot structure for silicon?
    10·1 answer
  • An average human bad temperature is 98.6 Fahrenheit what is the equivalent temperature in degrees celsius
    6·1 answer
  • What was George Washington Caver professional information ​
    14·2 answers
  • The density of mercury is 13.6 g/cm3, What is its density in mg/mm3?
    9·1 answer
  • DESPERATE WILL GIVE BRAINLIST AND THANKS
    14·1 answer
  • Which type of fuel can only be used in certain geographic areas?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!