Posted by Mary on Tuesday, June 25, 2013 at 9:17pm.
What quantity of heat is required to produce 5 mol of oxygen gas by this reaction? HgO(s) → Hg(l) + ½ O2(g), ΔH = +90.7kJ
I calculated 90.7*5, but my online homework says its wrong how do I calcuate this?

Chemistry answer check  Devron, Tuesday, June 25, 2013 at 9:36pm
907.5 kJ

Chemistry answer check  Devron, Tuesday, June 25, 2013 at 10:39pm
What do you have to multiply ½ O2 by to get 5 moles of O2?
1/2x=5
Solving for x
x=10, so you have to multiply O2 and everything else by 10 to get the following:
10HgO(s) → 10Hg(l) +5O2(g), ΔH = +907kJ not 907.5 kj. I apologize, a typo in my original response.

Chemistry answer check  cam, Wednesday, March 23, 2016 at 8:25pm
907
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