Explanation:

In stimulate to identify how plenty of atoms are in this sample, we require to transform this sample right into moles. Calcium has a molar mass of

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grams per mole.

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Avogadro"s number tells united state that there 

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 atoms in one mole of any element. We deserve to use this conversion to uncover the total number of atoms in the sample.

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Correct answer:


Explanation:

To perform this problem we have to first convert grams to moles, then moles come atoms utilizing Avogadro"s number:

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Explanation:

To answer this question, we have actually to find the number of moles of sodium in this compound. Keep in mind that there room two sodium atoms per molecule. Then, main point the complete moles of salt by Avogadro"s number.

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You have a neutral balloon. If you to be to include 21,000 electron to it, what would its net charge be?

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 = charge of one electron


Explanation:

The elemental fee is the magnitude of charge, in Coulombs, that each electron or proton has. Since electrons have actually a negative charge, don"t forget to include a an unfavorable sign right into the equation.

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*

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When you convert the answer come microcoulombs, the answer is 

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:

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Explanation:

This question requires an understanding of what avogadro"s number in reality represents. Avogadro"s number, 6.022 * 1023 is the variety of things in one mole. The question shows that there is 1 mole of H2. Thus there space 6.022 * 1023 molecule of H2. Yet the inquiry is asking for the lot of atom in 1 mole that H2. For this reason we must consider the makeup of one H2 molecule, where we check out that the is a diatomic molecule. Thus we need to multiply 6.022 * 1023 by 2 to calculate the number of individual atoms present in 1 mole that H2. We find our answer to be 1.2044 * 1024.


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Example inquiry #18 : dimensions


A chemist has 

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the
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.

How numerous molecules that

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walk she have?


Possible Answers:
Correct answer:

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Explanation:

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Example inquiry #1 : utilizing Avogadro's Number


How plenty of hydrogen atoms are in 46.3 g of ethanol,

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?


Possible Answers:
Correct answer:

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Explanation:

To identify the number of hydrogen atoms, division the mass of ethanol by its molar fixed to acquire moles the ethanol.

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Multiply this by 6 atoms that hydrogen every molecule that ethanol and by Avogadro"s number to acquire the number of hydrogen atoms.

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Example question #20 : measurements


How numerous hydrogen atoms are present in 500 mL the water at room temperature?

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Possible Answers:
Correct answer:

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Explanation:

Use the thickness of water, the molar mass of water, and Avogadro"s number to calculate the number of molecules the water.

We have 500mL that water. Usage the thickness to convert this come grams; then usage the molar mass of water to transform this come moles.

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There room two mole of hydrogen atoms per one mole the water.

See more: What Does The Power Of Christ Compels You Mean To Compel Them?

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Finally, multiply by Avogadro"s number.

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