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3 years ago

Calculate the standard emf for the following reaction:

1 answer:

4 0

In order to solve this, we need to know the standard cell potentials of the half reaction from the given overall reaction.
The half reactions with their standard cell potentials are:
2ClO−3(aq) + 12H+(aq) + 10e- = Cl2(g) + 6H2O(l)
E = +1.47

Br(l) + 2e- = 2Br-
E = +1.065

We solve for the standard emf by subtracting the standard emf of the oxidation from the reducation, so:
1.47 - 1.065 = 0.405 V

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Predict the ground-state electron configuration of the following ions. Write your answers in abbreviated form, that is, beginnin

abruzzese [7]

These are three questions and three complete answers

Answer:

a) Cr²⁺: [Ar] 4s² 3d²

b) Cu²⁺: [Ar] 4s² 3d⁷

c) Co³⁺: [Ar] 4s² 3d⁴

Explanation:

a) Cr²⁺

Z = 24

Number of protons: 24

Number of elecrons of the neutral atom: 24

Charge of the ions: + 2

Number of electrons of the ion: 24 - charge = 24 - 2 = 22.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 22 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d²

b) Cu²⁺

Z = 29

Number of protons: 29

Number of elecrons of the neutral atom: 29

Charge of the ion: + 2

Number of electrons of the ion: 29 - charge = 29 - 2 = 27.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 27 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d⁷

c) Co³⁺

Z = 27

Number of protons: 27

Number of elecrons of the neutral atom: 27

Charge of the ion: + 3

Number of electrons of the ion: 27 - charge = 27 - 3 = 24.

Electron configuration:

Fill the orbitals in increasing order of energy. Using Aufbau's rules the order is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ .....

Hence, for 24 electrons you get:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴

Abbreviated notation: since the last complete level is the number 3s² 3p⁶, you use the noble gas of the period 3, which is Ar, and the configuration is:

[Ar] 4s² 3d⁴

6 0

4 years ago

If you place rice on top or a speaker, what will happen to the rice when you turn the speaker on?

Dovator [93]

Answer:

The rice will move

Explanation:

the sound vibration and waves will cause the rice to move

3 0

3 years ago

Please help me with this homework

Stolb23 [73]

Havhzbjzbhx zbznsonshz Zbsjsis 1
sj xisn d sk shshs dj h Bs jshosusugs sjizhxbebs dnshs dns jsygs s. Si d d

6 0

3 years ago

Answers please would highly appreciate it

Ksju [112]

Answer:

All I know is that 10 is A

5 0

3 years ago

What volume does 4.24g of argon gas occupy at 58.2 degrees celcuis and 1528torr

lilavasa [31]

Answer:

V = 1.434 L

Explanation:

Given data:

Mass of argon = 4.24 g

Temperature = 58.2 °C

Pressure = 1528 torr

Volume = ?

Solution:

58.2 °C = 58.2 + 273 = 331.2 K

1528/760= 2.01 atm

Number of moles:

Number of moles = mass/molar mass

Number of moles = 4.24 g / 39.948 g/mol

Number of moles = 0.106 mol

Volume:

PV = nRT

V = nRT/P

V = 0.106 mol ×0.0821. atm. L. mol⁻¹. K⁻¹ × 331.2K/ 2.01 atm

V = 2.88 atm L/ 2.01 atm

V = 1.434 L

6 0

3 years ago