Explanation:

In bespeak to determine how countless atoms room in this sample, we require to convert this sample right into moles. Calcium has a molar fixed of

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grams per mole.

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Avogadro"s number tells us that there 

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 atoms in one mole of any kind of element. We can use this counter to uncover the total number of atoms in the sample.

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Correct answer:


Explanation:

To perform this trouble we have actually to an initial convert grams to moles, then moles to atoms using Avogadro"s number:

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Explanation:

To price this question, we have actually to discover the number of moles of sodium in this compound. Keep in mind that there are two sodium atoms every molecule. Then, multiply the complete moles of sodium by Avogadro"s number.

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You have actually a neutral balloon. If you to be to add 21,000 electrons to it, what would its net fee 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 a an adverse charge, don"t forget to include a negative sign right into the equation.

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*

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When you transform the answer come microcoulombs, the price is 

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:

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Explanation:

This inquiry requires an understanding of what avogadro"s number actually represents. Avogadro"s number, 6.022 * 1023 is the number of things in one mole. The question shows that over there is 1 mole the H2. Hence there space 6.022 * 1023 molecules of H2. Yet the concern is questioning for the quantity of atoms in 1 mole the H2. For this reason we must consider the assembly of an H2 molecule, where we see that that is a diatomic molecule. Therefore we must multiply 6.022 * 1023 by 2 to calculate the number of individual atoms existing in 1 mole that H2. We discover our answer to be 1.2044 * 1024.


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Example inquiry #18 : measurements


A chemist has 

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of
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.

How countless molecules of

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go she have?


Possible Answers:
Correct answer:

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Explanation:

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Example concern #2 : using Avogadro's Number


How countless hydrogen atoms room in 46.3 g that ethanol,

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?


Possible Answers:
Correct answer:

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Explanation:

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

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

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Example question #20 : dimensions


How numerous hydrogen atoms are present in 500 mL of water in ~ room temperature?

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Possible Answers:
Correct answer:

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Explanation:

Use the thickness of water, the molar massive of water, and also Avogadro"s number to calculation the variety of molecules that water.

We have actually 500mL of water. Use the density to transform this to grams; then use the molar mass of water to transform this come moles.

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

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Finally, multiply by Avogadro"s number.

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