Question #00f88

1 Answer
May 28, 2017

Answer:

#2.41xx10^24" atoms"#

Explanation:

You are given #4.00# moles of strontium. We also are taught that a mole is just an amount of things. Just like the word "dozen" means "12 things", the word "mole" just means #602# hexillion things. This is Avogadro's number and is written

#1" mole"=6.02xx10^23# things, or this case, atoms.

This equation gives us two possible conversion factors:

Either #(1" mole")/(6.02xx10^23" atoms")#, or #(6.02xx10^23" atoms")/(1" mole")#

Use the conversion factor which cancels out the "moles" and keeps the number of atoms. So this is the conversion factor with moles in the denominator.

#4.00cancel(" moles")xx(6.02xx10^23" atoms")/(1cancel(" mole"))=24.1xx10^23" atoms"#

ANSWER: #2.41xx10^24" atoms"#