High School Chemistry : Using Avogadro's Number

Study concepts, example questions & explanations for High School Chemistry

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Example Questions

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Example Question #11 : Using Avogadro's Number

How many molecules are in ?

Possible Answers:

None of these

Correct answer:

Explanation:

According to Avogadro's law, each mole of a compound contains . Use dimensional analysis to find the number of molecules in .

Example Question #11 : Using Avogadro's Number

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

Possible Answers:

Correct answer:

Explanation:

Use dimensional analysis:

Example Question #12 : Using Avogadro's Number

A container has  molecules of gas in it.  How many moles of the gas are in the container?

Possible Answers:

 moles

 moles

Not enough information to solve the problem.

 moles

Correct answer:

 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 -

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