Question #6a1e0

1 Answer
Stefan V.
Dec 4, 2017

6.8 * 10^(-5)

Explanation:

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.

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