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Exam
Olympiad workbook
Subject
NSEC
Chapter
Thermodynamics (C)

Olympiad workbook · NSEC · Thermodynamics (C)

The change in internal energy (Δ U) for the reaction...

The change in internal energy (ΔU)(\Delta \mathrm{U}) for the reaction H2( g)+Br2( g)→2HBr(l)\mathrm{H}_2(\mathrm{~g})+\mathrm{Br}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HBr}(l) when 2.0 moles each of Br2( g)\mathrm{Br}_2(\mathrm{~g}) and H2( g)\mathrm{H}_2(\mathrm{~g}) react is \left(\mathrm{H}_2(\mathrm{~g})+\mathrm{Br}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HBr}(\mathrm{~g}) ; \Delta \mathrm{H}_{\text {reaction }}=-109 \mathrm{~kJ} ; \Delta \mathrm{H}_{\text {vap }} \text { of } \mathrm{HBr}=213 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)

Options

  1. A−644 kJ-644 \mathrm{~kJ}
  2. B644 kJ
  3. C−322 kJ-322 \mathrm{~kJ}
  4. D−106 kJ-106 \mathrm{~kJ}

Correct answer

D. −106 kJ-106 \mathrm{~kJ}

Step-by-step solution

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