What is the mass of #3.54*10^24# molecules of rubidium oxide?

1 Answer
May 28, 2016

Answer:

It is a fact that #N_A# #Rb_2O# particles have a mass of #186.94*g#.

Explanation:

Given that #6.02214xx10^24# formula units of #Rb_2O# have a mass of #186.94*g#, the given number of #Rb_2O# formula units have a mass of:

#(3.54xx10^24" formula units of " Rb_2O)/(6.02214xx10^24" formula units "mol^-1*Rb_2O)#

#=#

#??" moles of rubidium oxide" #

So the mass #~=# #1/2# #mol# #xx186.94*g*mol^-1, "i.e. "93*g#.