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BlackZzzverrR [31]
3 years ago
15

In Fe atom, which subshell experience the lowest effective nuclear charge and are hence the first removed upon ionization?

Chemistry
1 answer:
polet [3.4K]3 years ago
8 0

Answer:

(D) 4s

Explanation:

The electronic configuration of a Fe atom is:

1s² 2s² 2p⁶ 3s² 3p6 3d⁶ 4s².

<u>The subshell located farthest from the nucleus is 4s</u>, that's why it experiences the lowest effective nuclear charge.

This can be seen when looking at the electronic configurations of Fe⁺² and Fe⁺³:

Fe⁺² ⇒ 1s² 2s² 2p⁶ 3s² 3p6 3d⁶.

Fe⁺³ ⇒ 1s² 2s² 2p⁶ 3s² 3p6 3d⁵.

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5 0
3 years ago
How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?
Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

pH= -log[H]\\pH= -log (\frac{kw}{[OH]})

8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}

[OH]=1.69E-6

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

Cu(OH)_2 -> Cu^{2+} + 2OH^-

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

Kps= [Cu^{2+}] [OH]^2

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

Kps= s*(2s+1.69E-6)^2

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is s=4.96E-8 mol/L

Now, let us calculate the moles in 1 L:

moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles

7 0
3 years ago
I NEEED HELP PLEASE! :)
lesantik [10]

Answer:

okay I do t know if I ×+÷_ but I think the answer is 348

5 0
3 years ago
Read 2 more answers
For an electron in an atom to change from ground state to an excited state,
barxatty [35]
It must absorb energy in the form of for example heat which gives it the energy required to become excited

hope that helps 
8 0
3 years ago
Which of the following are the correct formulas for potassium oxide and calcium oxide respectively
Orlov [11]

Explanation:

potassium oxide is K2O

calcium oxide is CaO

calcium oxide is used to make glass

potassium oxide is used in fertilizer

7 0
3 years ago
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