How do you calculate the percentage composition of Oxygen in #Zn(NO_3)_2#?

1 Answer
anor277 · MeneerNask
Feb 25, 2016

#(6xx15.999*g*mol^-1)/(189.36*g*mol^-1)# #xx# #100%# #=# #??#

Explanation:

#15.999*g*mol^-1# is of course the molar mass of the oxygen atom. #189.36*g*mol^-1# is the molar mass of zinc nitrate. So it is a bit under 50% by mass.

Molar mass of zinc nitrate:
You can calculate this by adding all the atomic masses of the elements in this compound:
#1xxZn+2xxN+6xxO#

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