How many molecules are there in 220 grams of #CF_4#?

1 Answer
Meave60
Dec 10, 2016

There are #1.5xx10^24# #"molecules"# #"in"# #"220 g"# #"CF"_4"#.

Explanation:

Divide the given mass of carbon tetrafluoride by its molar mass. Then multiply times #6.022xx10^23 "molecules/mol"#.

#"CF"_4"# molar mass : #"88.005 g/mol"#
https://pubchem.ncbi.nlm.nih.gov/compound/6393

#(220cancel"g CF"_4)/(88.005cancel"g/mole" "CF"_4)xx(6.022xx10^23"molecules CF"_4)/(1cancel"mol CF"_4)=1.5xx10^24"molecules CF"_4"# (rounded to two significant figures)

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