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4 years ago

If an atom has 8 valence electrons, how many electrons does it need to gain to achieve a stable electron configuration?

Chemistry

2 answers:

Veseljchak [2.6K]4 years ago

6 0

Then, it's already stable and does not need any change....

Fofino [41]4 years ago

5 0

<u>Answer:</u> The atom will neither gain or loose electrons.

<u>Explanation:</u>

Every element obeys octet rule which is defined as the rule in which an atom occupies eight electrons in its outermost shell.

We are given:

Number of valence electrons or number of electrons present in outermost shell = 8

The above given element is already stable because it is obeying octet rule completely.

Thus, this atom will neither gain or loose electrons to be stable.

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A 0.870 g sample of a monoprotic acid is dissolved in water and titrated with 0.300 M KOH.

Vedmedyk [2.9K]

<u>Answer:</u> The molar mass of monoprotic acid is 126.1 g/mol

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Molarity of KOH solution = 0.300 M

Volume of solution = 23.00 mL

Putting values in above equation, we get:

$0.300M=\frac{\text{Moles of KOH}\times 1000}{23.00}\\\\\text{Moles of KOH}=\frac{0.300\times 23.00}{1000}=0.0069moles$

The chemical equation for the reaction of monoprotic acid and KOH follows:

$HA+KOH\rightarrow KA+H_2O$

By Stoichiometry of the reaction:

1 mole of KOH reacts with 1 mole of HA

So, 0.0069 moles of KOH will react with = $\frac{1}{1}\times 0.0069=0.0069$ moles of HA

To calculate the molar mass for given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of HA = 0.870 g

Moles of monoprotic acid = 0.0069 mol

Putting values in above equation, we get:

$0.0069mol=\frac{0.870g}{\text{Molar mass of monoprotic acid}}\\\\\text{Molar mass of monoprotic acid}=\frac{0.870g}{0.0069mol}=126.1g/mol$

Hence, the molar mass of monoprotic acid is 126.1 g/mol

3 0

3 years ago

What is the number of carbon atoms in a cycloalkyne with 8 hydrogen atoms

Slav-nsk [51]

Answer:

Explanation:

C4H8

7 0

3 years ago

How many moles of C are in a sample of C5H12 that also contains 22.5g of H?

pishuonlain [190]

The number of moles of C present in C₅H₁₂ that contains 22.5 g of H is 9.375 moles

<h3>How to determine the mass of C₅H₁₂ that contains 22.5 g of H</h3>

1 mole of C₅H₁₂ = (12×5) + (1×12) = 72 g

Mass of H in 1 mole of C₅H₁₂ = 12 × 1 = 12 g

Thus,

12 g of H is present in 72 g of C₅H₁₂

Therefore,

22.5 g of H will be present in = (22.5 × 72) / 12 = 135 g of C₅H₁₂

<h3>How to determine the mole of C present in 135 g of C₅H₁₂</h3>

72 g of C₅H₁₂ contains 5 moles of C

Therefore,

135 g of C₅H₁₂ will contain = (135 × 5) / 72 = 9.375 moles of C

Thus, 9.375 moles of C is present in C₅H₁₂ that contains 22.5 g of H

Learn more about mole:

brainly.com/question/13314627

#SPJ1

8 0

2 years ago

How many moles are there in 6.33x10^23 molecules of NH3?

nadezda [96]

About 1.051 moles (depends on how u round it)

6 0

3 years ago

When two or more substances combine, but each keeps it own properties,the new combination is called a (an)

Harman [31]

The new combination is called a mixture.

In mixtures, since the substances are not chemically combined together, they still remain their own physical and chemical properties, and can be separated by simple physical methods such as filtration or distillation.

On the other hand, if the two or more substances are combined where they get new properties, the new combination will be called a compound. They cannot be separated by physical methods, but chemical methods such as heating or electrolysis.

7 0

3 years ago