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28/09/2021 8:45 pm
Topic starter
For the combustion reaction at 298 K
2Ag(s) + 1/2O2(g) → 2Ag2O(s)
Which of the following alternatives is correct?
(a) ΔH = ΔU
(b) ΔH > ΔU
(c) ΔH < ΔU
(d) ΔH and ΔU has no relation with each other
1 Answer
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28/09/2021 8:54 pm
Correct answer: (c) ΔH < ΔU
Explanation:
ΔH = ΔU + ΔnRT
Δn = nP - nR
Now, Δn = 2 - \(\frac{5}{2}\) = -\(\frac{1}{2}\)
∴ ΔH = ΔU - \(\frac{1}{2}\)RT
Thus, ΔU = ΔH + \(\frac{1}{2}\)RT
∴ ΔU > ΔH