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Answer 1 · 2014-11-25T06:23:21

A mole is a collection that contains #"6.022 x 10"^23# atoms/ molecules /ions of a substance.

1 mole of #"BF"_3# has #"6.022 x 10"^23# molecules.

To calculate the number of moles in #"7.04 x 10"^22# molecules of #"BF"_3# we will use dimensional analysis.

The following diagram is an example of how to use dimensional analysis to convert molecules to moles.

enter image source here

Following the example:

#"7.04 x 10"^22# molecules x ( #"1 mole/6.022 x 10"^23"# molecules) = #"0.117 mole"#