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3 years ago

How many Oxygen atoms are in 2NA(OH)3

Chemistry

2 answers:

Dmitry [639]3 years ago

4 0

Answer:

3 oxygen atom

hope it helps.

leva [86]3 years ago

3 0

Answer:

Explanation:

There are 3 oxygen atoms.

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In your own words, explain why each of the filler blocks (s,p,d,f) on the periodic chart have their characteristic width(number)

Charra [1.4K]

Answer:

Each of the four blocks of the periodic table is the collection of elements that have common valence orbitals, or that their valence are found in one of the four orbitals with azimuthal quantum number 0, 1, 2, or 3 which corresponds to the shape (s), principal (p), diffuse (d), or fundamental (f) orbitals respectively

The maximum number of electrons in the s-orbital = 2 electrons

The maximum number of electrons in the p-orbital = 6 electrons

The maximum number of electrons in the d-block = 10 electrons

The maximum number of electrons in the f-orbital = 14 electrons

Therefore, given that the elements of the within each of the blocks have their valence electron in the corresponding orbital in which they are located on the periodic table, given the periodic nature of the periodic table, the width of each block of elements corresponds to the maximum number of elements that can be found in their valence orbital.

Therefore, we have;

The width of the s-block elements = 2 block units

The width of the p-block elements = 6 block units

The width of the d-block elements = 10 block units

The width of the f-block elements = 14 block units

Explanation:

6 0

3 years ago

Leonard adds 5 grams of sugar to 1 liter of water to make one sugar solution. Then he adds 10 grams of sugar to 1 liter of water

Yanka [14]

Answer:

See explanation below

Explanation:

There are many statements and ways to compare both solutions, but the commons one are concentration or molarity, and %m/V.

Both of these statements are valid to compare both solutions, however, molarity is the best to use because with a single number, we can see which solution is more concentrated.

To calculate the molarity of any solution we use the following expression:

M = n/V

n: number of moles of solute.

V: volume of solution in liter.

Now, as the solvent of the solution is water, and the solute is a solid, the volume of solution will be the same volume of the solvent.

The common sugar is the sucrose, and the molecular formula of this is C12H22O11, the molar mass is 342.3 g/mol.

With this, we can calculate the moles:

n = m/MM

n₁ = 5/342.3 = 0.0146 moles

n₂ = 10/342.3 = 0.0292 moles

Now, it's time to see the concentration of each solution:

M₁ = 0.0146 / 1 = 0.0146 M

M₂ = 0.0292 / 1 = 0.0293 M

With this we can conclude that solution 2 is more concentrated than solution 1. In other words M₂ > M₁

7 0

4 years ago

In performing the "STEP TEST" for 3 minutes, what was your score ?

slava [35]

Answer:

Explanation:

That's my score when I did a 3-minute Step test

8 0

3 years ago

Enter an equation showing how this buffer neutralizes added aqueous acid (HI). Express your answer as a chemical equation. Ident

andrey2020 [161]

Answer:

$H^++NH_3\rightleftharpoons NH_4^+$

Explanation:

Hello there!

In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:

$H^++NH_3\rightleftharpoons NH_4^+$

Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.

Best regards!

5 0

3 years ago

Select the correct statement below:

uranmaximum [27]

Answer: The correct answer is Option D.

Explanation:

Valence electrons are defined as the electrons which are present in the outermost shell of the atom. Outermost shell has the highest value of 'n' that is principal quantum number.

For the given options:

Option A:

Phosphorus is the 15th element of the periodic table having electronic configuration $1s^22s^22p^63s^23p^3$

Number of valence electrons = 2 + 3 = 5

The '3s' orbital is fully filled and all the three '3p' orbitals are half filled for the given element.

So, the given statement is not correct.

Option B:

Aluminium is the 13th element of the periodic table having electronic configuration $1s^22s^22p^63s^23p^1$

Number of valence electrons = 2 + 1 = 3

The '3s' orbital is fully filled and one of all the three '3p' orbitals is half filled and rest are empty for the given element.

So, the given statement is not correct.

Option C:

Calcium is the 20th element of the periodic table having electronic configuration $1s^22s^22p^63s^23p^64s^2$

Number of valence electrons = 2

The '4s' orbital is fully filled and all the three '4p' orbitals are half filled for the given element. '4s' sub-shell has only one orbital.

So, the given statement is not correct.

Option D:

Sodium is the 11th element of the periodic table having electronic configuration $1s^22s^22p^63s^1$

Number of valence electrons = 1

The '3s' orbital is half filled and all the three '3p' orbitals are half filled for the given element.

So, the given statement is not correct.

Hence, the correct answer is Option D.

5 0

4 years ago