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High School Chemistry : Using Avogadro's Number

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Example Questions

Example Question #11 : Using Avogadro's Number

How many molecules are in $5.2mol\:KCl$ ?

Possible Answers:

$3.13\cdot10^{22}\text{molecules}$

$6.02\cdot10^{23}\text{molecules}$

None of these

$5.14\cdot10^{24}\text{molecules}$

$3.13\cdot10^{24}\text{molecules}$

Correct answer:

$3.13\cdot10^{24}\text{molecules}$

Explanation:

According to Avogadro's law, each mole of a compound contains $6.02\cdot10^{23}\text{molecules}$ . Use dimensional analysis to find the number of molecules in 5.2mol .

$5.2mol\: KCl\cdot \frac{6.02\cdot 10^{23}\text{molecules}}{1mol}=3.13\cdot10^{24}\text{molecules}$

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Example Question #21 : Measurements

Determine the number of sodium atoms in a 150g block of sodium chloride.

Possible Answers:

155atoms

$2.27*10^{24}atoms$

$2.05*10^{24}atoms$

$1.55*10^{24}atoms$

1.55atoms

Correct answer:

$1.55*10^{24}atoms$

Explanation:

Use dimensional analysis:

$150gNaCl*\frac{1molNaCl}{58.44gNaCl}*\frac{1 mol Na}{1 mol NaCl}*\frac{6.02*10^{23}atoms}{1 mol}=1.55*10^{24}atoms$

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Example Question #22 : Measurements

A container has $4.33\times 10^{24}$ molecules of gas in it. How many moles of the gas are in the container?

Possible Answers:

Not enough information to solve the problem.

0.14 moles

4.33 moles

7.19 moles

Correct answer:

7.19 moles

Explanation:

Avogadro's number tells us how many molecules of gas are in one mole of the container. We are essentially doing a unit conversion from "number of molecules" to moles -

$4.33\times 10^{24} molecules\left ( \frac{1 mole}{6.022\times 10^{23} molecules} \right )=7.19 moles$

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High School Chemistry : Using Avogadro's Number

Study concepts, example questions & explanations for High School Chemistry

All High School Chemistry Resources

Example Questions

Example Question #11 : Using Avogadro's Number

Example Question #21 : Measurements

Example Question #22 : Measurements

All High School Chemistry Resources

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