A balloon contains #2.58 * 10^24# molecules of methane gas. How many moles of methane are in this balloon?

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Answer 1 · 2016-03-24T22:27:53

A farmer collects 150 eggs; how many dozen eggs does he collect?

#("150 eggs")/("12 eggs per dozen")# #=# #12# #1/2# #dozen#

#(2.58xx10^24" molecules")/(6.022xx10^23*"molecules"*mol^-1)#. This is approx. #2# #mol#?

Answer 2 · 2016-03-25T00:59:06

#2.58xx10^24"molecules CH"_4"# contains #4.28"mol CH"_4"#.

#1 "mole CH"_4=6.022xx10^23 "molecules CH"_4"#

In order to convert molecules to moles of a substance, divide the number of given molecules by #6.022xx10^23 "molecules/mol"#.

#2.58xx10^24cancel"molecules CH"_4xx(1"mol CH"_4)/(6.022xx10^23cancel"molecules CH"_4)="4.28 moles CH"_4"# rounded to three significant figures