What mass of hydrogen atoms are in 166 g of zinc hydroxide: Zn(OH)2 (Mw. 99.43)?

1 Answer
Apr 21, 2018

Well, how moles of zinc hydroxide have you got?

Explanation:

And so...we got...#(166*g)/(99.43*g*mol^-1)=1.67*mol#..

But given a formula of #Zn(OH)_2# CLEARLY we got a TWICE MOLAR quantity with respect to hydrogen...i.e. a mass...

#1.67*molxx2xx1.00794*g*mol^-1=3.37*g# with respect to hydrogen....