Answer to Question #205196 in Chemistry for Ankush

Question #205196

The equation for the decomposition of mercury(II) oxide is as follows. Determine Heat of formation for HgO(s)?

2HgO(s)+182KJ=2Hg(l)+O2(g)


1
Expert's answer
2021-06-11T22:47:45-0400

"2HgO(s)+182KJ=2Hg(l)+O2(g)"

So,

heat of the reaction, ∆Hrxn = +182Kj


The heart of the reaction will be

∆Hrxn =2×heat of formation of Hg(l) + heat of formation of O2(g) – (heat of formation of HgO×2)


Or, 182 Kj =2×∆Hf(Hg) + ∆Hf(O2) – ∆Hf(HgO)


Since, heat of formation of elements is zero,

So, ∆Hf(HgO) = 0 kj/mol and ∆Hf(O2) = 0 kj/mol


So, 182 Kj = 2×0 + 0 – ∆Hf(HgO)

Or, ∆Hf(HgO) = –182 Kj


So, heat of formation of HgO = –182 Kj/mol




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