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atroni [7]
2 years ago
13

Explain why when an ion is formed, the mass of the atom does not change.

Chemistry
1 answer:
svetoff [14.1K]2 years ago
3 0

Answer:

Atoms are made up of protons, neutrons, and electrons. The mass of an atom is determined by the total number of neutrons and protons in the nucleus. The difference between an atom and an ion is the number of electrons. The change of electrons does not change the mass because electrons have a negligible mass. In other words, the mass of electrons is so small, it is considered insignificant.

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How many potassium atoms are in 250.0 grams of potassium?
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Hi!


The correct option would be 3.85x10^(24)


To find the number of atoms in 250g of potassium, we need to first calculate the number of atoms in


1 mole of Potassium = 39g which contains 6.022x10^(23) atoms of K

<em>(Avogadro's constant value for the amount of molecules/atoms in one mole of any substance)</em>

<em>Solution</em>

So as 39g of Potassium contains 6.022x10^(23) K atoms

1g of Potassium would contain 6.022x10^(23) / 39 = 1.544 x10^(22) atoms

So 250g of Potassium would contain 1.544x10^(22) x 250 = 3.86x10^(24) atoms

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Determine the molarity of a solution that contains 30 moles naoh in 0.80 liters of solution?
UkoKoshka [18]

Taking into account the definition of molarity,  the molarity of a solution that contains 30 moles naoh in 0.80 liters of solution is 37.5 \frac{moles}{liters}.

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

Molarity=\frac{number of moles}{volume}

Molarity is expressed in units \frac{moles}{liters}.

<h3>This case</h3>

In this case, you have:

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  • volume= 0.80 L

Replacing in the definition of molarity:

Molarity=\frac{30 moles }{0.80 L}

Solving:

<u><em>Molarity= 37.5 </em></u>\frac{moles}{liters}<em />

Finally, the molarity of a solution that contains 30 moles naoh in 0.80 liters of solution is 37.5 \frac{moles}{liters}.

Learn more about molarity:

brainly.com/question/9324116

brainly.com/question/10608366

brainly.com/question/7429224

#SPJ1

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