Question #162a7

1 Answer
Manish Bhardwaj · Stefan V.
Nov 25, 2014

A mole is a collection that contains #6.02 * 10^23# atoms/ molecules /ions of a substance.

1 mole of #BF_3# has #6.02 * 10^23# molecules.

To calculate the number of molecules in 1.25 moles of #BF_3# we will use dimensional analysis.

#1.25# #"moles"# #BF_3 * (6.022 * 10^23" molecules") / ("1 mol "BF_3)#

#1.25 * (6.022 * 10^23 "molecules") / 1 #

#7.53 * 10^23 "molecules"#.

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