Explanation:

In stimulate to identify how countless atoms space in this sample, we need to convert this sample into moles. Calcium has actually a molar fixed 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 type of element. We have the right to use this switch to find the total variety of atoms in the sample.

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Correct answer:


Explanation:

To execute this difficulty we have actually to very 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 uncover the variety of moles of sodium in this compound. Keep in mind that there are two salt atoms per molecule. Then, main point the total moles of sodium by Avogadro"s number.

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You have actually a neutral balloon. If you were to include 21,000 electrons to it, what would its net fee be?

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 = charge of one electron


Explanation:

The elemental charge is the magnitude of charge, in Coulombs, the each electron or proton has. Because electrons have a negative 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 to microcoulombs, the price is 

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:

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Explanation:

This inquiry requires an expertise of what avogadro"s number actually represents. Avogadro"s number, 6.022 * 1023 is the number of things in one mole. The question indicates that over there is 1 mole the H2. Hence there space 6.022 * 1023 molecule of H2. But the inquiry is questioning for the lot of atoms in 1 mole of H2. Thus we must consider the makeup of one H2 molecule, wherein we see that it is a diatomic molecule. Thus we have to multiply 6.022 * 1023 by 2 to calculate the variety of individual atoms present in 1 mole that H2. We uncover our answer come be 1.2044 * 1024.


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Example question #8 : utilizing Avogadro's Number


A chemist has 

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of
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.

How plenty of molecules that

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go she have?


Possible Answers:
Correct answer:

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Explanation:

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Example inquiry #9 : using Avogadro's Number


How countless hydrogen atoms are in 46.3 g the ethanol,

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?


Possible Answers:
Correct answer:

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Explanation:

To determine the number of hydrogen atoms, divide the fixed of ethanol through its molar mass to get moles the ethanol.

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

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Example inquiry #10 : utilizing Avogadro's Number


How numerous hydrogen atoms are present in 500 mL the 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 Avogadro"s number to calculation the number of molecules of water.

We have 500mL the water. Use the thickness to convert this come grams; then use the molar massive of water to transform this to moles.

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There are two moles of hydrogen atoms per one mole the water.

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Finally, multiply by Avogadro"s number.

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