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Aliun [14]
2 years ago
7

Calculate the mass percentage of potassium in K3PO4

Chemistry
1 answer:
Greeley [361]2 years ago
4 0

1) determine molar mass of K₃PO₄

=3(39.10)+30.97+4(16)\\=212.27\ g/mol

2) determine total mass of potassium atoms in K₃PO₄

=3(39.10)\\=117.3\ g

4) divide by molar mass and multiply by 100

=\frac{117.30}{212.27} × 100

= 55.25981062% (round as you wish)

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Hope it helped
4 0
3 years ago
Read 2 more answers
One gram of carbon contains 50,200,000,000,000,000,000,000 atoms. express the number of carbon atoms in scientific notation
german
N(C)=5,02·10²² atoms

calculation check:

N(C)=(1/12)*6.022*10²³=0.5018*10²³≈5.02·10²²
5 0
3 years ago
A white crystalline salt conducts electricity when it is melted and when it dissolves in water.
sergeinik [125]

Answer: Option (a) is the correct answer.

Explanation:

Ionic salts are defined as the salts which tend to contain ionic bonds as there occurs transfer of electrons between its combining atoms.

So, when an ionic salt melts or it is dissolved in water then it will dissociate into its respective ions and as electricity is the flow of electrons or ions. Hence, this salt is then able to conduct electricity.

As covalent compounds are insoluble in water so, they do no dissociate into ions. Hence, they do not conduct electricity.

Similarly, metallic and network solids do not dissociate into ions either when melted or dissolved in water. Therefore, they also do not conduct electricity.

Thus, we can conclude that when a white crystalline salt conducts electricity when it is melted and when it dissolves in water then this bond is of ionic type.

7 0
3 years ago
A postulate is a statement recognized as a truth. The kinetic molecular theory has five postulates. Which of the following is NO
MrMuchimi

Answer:

2nd option is NOT a postulate of kinetic theory of gases

Explanation:

actually particles move in straight random motion and create bombardment with the molecules and container

3 0
3 years ago
If 45 mL of water are added to 250 mL of a 0.75 M K2SO4 solution, what will the molarity of the diluted solution be?
krok68 [10]

Answer:

\large\boxed{\large\boxed{0.64M}}

Explanation:

When you form a <em>diluted solution</em> from a mother (concentrated) solution, the moles of solute are determined by the mother solution.

The main equation is:

Molarity=\dfrac{\text{moles of solute}}{\text{volume of the solution in liters}}

Then, since the moles of solute is the same for both the mother solution and the diluted solution:

          \text{Molarity mother solution }\times\text{ volume mother solution}=\\\\=\text{Molarity diluted solution }\times\text{ volume diluted solution}

Substitute and solve for the molarity of the diluted solution:

           250mL\times 0.75M=(45mL+250mL)\times M\\\\\\M=\dfrac{250mL\times 0.75M}{295mL}=0.64M

8 0
3 years ago
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