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3 years ago

How many grams of Al(no2)3 should be added to 1.3L of water to prepare a 2.0M solution

Chemistry

1 answer:

Virty [35]3 years ago

3 0

Answer: 429 grams of $Al(NO_2)_3$ should be added to 1.3 L of water to prepare 2.0 M solution

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=\frac{n}{V_s}$

where,

n = moles of solute $Al(NO_2)_3$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{165g/mol}$

$V_s$ = volume of solution in Liters

Now put all the given values in the formula of molarity, we get

$2.0M=\frac{xg}{165g/mol\times 1.3L}$

$x=429g$

Therefore, 429 grams of $Al(NO_2)_3$ should be added to 1.3 L of water to prepare 2.0 M solution

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Is the following true or false every element in the periodic table follows the aufbau principle

gulaghasi [49]

Answer:

True

Explanation:

It is true that every element in the periodic table follows the Aufbau's principle.

The principle states that "the sublevels with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order.
This is true when writing the electronic configuration of all atoms on the periodic table.

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3 years ago

If I have 13 protons and 12 electrons what is my charge?

Mnenie [13.5K]

Answer:

The charge would be +1

Explanation:

Protons have a positive charge while electrons have a negative charge. Therefore, it's simple subtraction. In every case, subtract the number of electrons from the number of protons.

13 - 12 = 1

Therefore the charge is +1

Here's one more example:

If the element chromium (Cr) has 24 protons and 28 electrons, what is its charge? Remember that protons have a positive charge and electrons have a negative charge.

24 - 28 = -4

Charge = -4

It would be written as followed when associating charge with a specific element: $Cr^{-4}$

If an element has a neutral charge, that means the number of protons and neutrons are the same. If you look at the periodic table of elements, all of the elements listed have a neutral charge. The 0 isn't showed in the corner because it isn't necessary.

Bonus Information:

This isn't related to your question, but I've come across confusions when it comes to particles. Remember that protons (+) and electrons (-) are the only particles that have a charge, therefore, as it says in it's name, neutrons are neutral or have no charge. Neutrons do not contribute to charge, but they do contribute to the <em>mass</em> of an atom. So the number of protons added to the number of neutrons equate to the mass of an atom. Electrons have mass, but it's so miniscule and insignificant that it doesn't even contribute to the overall mass of the atom, so don't count those.

Remember:

C = p - e

M = p + n

C = atomic charge, M = atomic mass, p =protons, n = neutrons, e = electrons

I hope this helps!

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3 years ago

Which statement accurately compares the trends in atomic number and atomic mass in the periodic table?

Kruka [31]

Answer : The correct option is, (C) Both the atomic mass and the atomic number increase from left to right.

Explanation :

The general trend of atomic number and atomic mass in the periodic table is,

Both atomic number and atomic mass increase from left to right and decreases from right to left in the periodic table due to the addition of the number of neutrons and the number of protons in the nucleus.

Hence, the correct option is, (C) Both the atomic mass and the atomic number increase from left to right.

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4 years ago

Read 2 more answers

A chemistry student is experimentally determining the boiling point

Hunter-Best [27]

Answer:

Option (e) should be discarded.

Explanation:

The given set of data is said to be precise if the values are close to each other. In this problem, a chemistry student is experimentally determining the boiling point of bromine.

In this case, all values are close to each other but option (e) i.e. 56.3° should be discarded to make his data precise.

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4 years ago

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tigry1 [53]

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4 years ago