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Question
For the reaction, \[\ce{A_{(s)} + 2B_{(g)} -> 5C_{(s)} + D_{(l)}}\], ∆H and ∆U are related as ____________.
Options
∆H = ∆U
∆H = ∆U + 2 RT
∆H = ∆U + RT
∆H = ∆U − 2 RT
MCQ
Fill in the Blanks
Solution
For the reaction, \[\ce{A_{(s)} + 2B_{(g)} -> 5C_{(s)} + D_{(l)}}\], ∆H and ∆U are related as ∆H = ∆U − 2 RT.
Explanation:
\[\ce{A_{(s)} + 2B_{(g)} -> 5C_{(s)} + D_{(l)}}\]
∆ng = 0 − 2 = −2;
∆H = ∆U + ∆ngRT
∴ ∆H = ∆U + (−2) (RT)
∆H = ∆U − 2 RT
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Enthalpy (H)
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