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Answer 1 · 2014-11-25T06:23:21

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

1 mole of ${BF}_{3}$ $"BF"_3$ has ${6.022 x 10}^{23}$ $"6.022 x 10"^23$ molecules.

To calculate the number of moles in ${7.04 x 10}^{22}$ $"7.04 x 10"^22$ molecules of ${BF}_{3}$ $"BF"_3$ 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:

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