Question #6a1e0

1 Answer
Dec 4, 2017


#6.8 * 10^(-5)#


The thing to remember here is that in order to have #1# mole of xenon difluoride, you need to have #6.022 * 10^(23)# molecules of xenon difluoride.

This number, which is known as Avogadro's constant, is essentially the definition of the mole. So #1# mole of a given substance will always contain #6.022 * 10^(23)# atoms/molecules/ions, whatever the case may be, of that substance.

You can thus say that your sample of xenon difluoride will be equivalent to

#4.1 * 10^(19) color(red)(cancel(color(black)("molecules XeF"_2))) * "1 mole XeF"_2/(6.022 * 10^(23)color(red)(cancel(color(black)("molecules XeF"_2)))) = color(darkgreen)(ul(color(black)(6.8 * 10^(-5)color(white)(.)"moles XeF"_2#

The answer is rounded to two sig figs, the number of sig figs you have for the number of molecules of xenon difluoride.