How many moles of disulfur decafluoride are present in #1.55*10^22# molecules of this compound?

1 Answer
Sep 5, 2016

Answer:

Approx. #0.025*mol#

Explanation:

There are #6.022xx10^23# #S_2F_10# units in one mole of the stuff by definition.

And thus #(1.55xx10^22" molecules")/(6.022xx10^23" molecules mol"^-1)# #~=# #0.025*mol#

#S_2F_10# is nasty stuff, though apparently it is quite odourless (this is a "good" property in a war gas, because some punter might get a lethal dose of it before he realizes he has been gassed; the substance has never been deployed in war).

Note that in this problem we could substitute any formula in the equation, and get the molar quantity.