Zena, warrior princess, had a rock with #HgO# in it. If she had 60 grams of Mercury after heating the rock, how many moles of #HgO# was in the rock?

1 Answer
May 28, 2018

Answer:

Is it not spelled #"Xena"#...she was a fit girl, as I recall...

Explanation:

She got #60*g# of mercury metal....this represents a molar quantity of #(60*g)/(200.6*g*mol^-1)=0.299*mol# with RESPECT to the metal. And thus there were #0.299*mol# with respect to mercuric oxide...

#HgO(s) + Delta rarr Hg(l) + 1/2O_2#

You have to heat the oxide fairly fiercley to effect the decomposition. the decomposition of #"cinnabar, mercuric sulfide"#, is much more facile.. What mass of #"mercuric oxide"# was reacted here?

#HgS(s) + Delta rarr Hg(l) + S(s)#