Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AIIMS 2006
Exam
AIIMS
Year
2006
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2006 · Chemistry · Thermodynamics (C)

The enthalpy change (Δ H) for the reaction, N_ 2(~g) + 3 H_ 2(~g)...

The enthalpy change (ΔH)(\Delta H) for the reaction, N2( g)+\mathrm{N}_{2(\mathrm{~g})}+3 H2( g)→\mathrm{H}_{2(\mathrm{~g})} \rightarrow2 NH3( g)\mathrm{NH}_{3(\mathrm{~g})}is −92.38 kJ-92.38 \mathrm{~kJ} at 298 K298 \mathrm{~K}. The internal energy change ΔU\Delta U at 298 K298 \mathrm{~K} is

Options

  1. A−92.38 kJ-92.38 \mathrm{~kJ}
  2. B−87.42 kJ-87.42 \mathrm{~kJ}
  3. C−97.34 kJ-97.34 \mathrm{~kJ}
  4. D−89.9 kJ-89.9 \mathrm{~kJ}.

Correct answer

B. −87.42 kJ-87.42 \mathrm{~kJ}

Step-by-step solution

ΔH=ΔU+ΔnRT\Delta H=\Delta U+\Delta n R T [where Δn=\Delta n= no. of molecules of products - no. of molecules of reactants] or, −92.38×1000=ΔU−2×8.314×298-92.38 \times 1000=\Delta U-2 \times 8.314 \times 298 or, ΔU=−87424 J=−87.424 kJ\Delta U=-87424 \mathrm{~J}=-87.424 \mathrm{~kJ}.
Practice Thermodynamics (C) on Quantrex Academy →

More from Thermodynamics (C)

A certain organic solvent has Δ H\_vap = 28.50\ kJ mol^ -1 and Δ S\_vap = 88.2\ J K^ -1 \… MHT CET Medical 2026Which of the following statements regarding spontaneous process is NOT true? MHT CET Medical 2026Calculate Δ H for a reaction, 2X_ (g) + Y_ (g) arrow 2Z_ (g) at 298 K if Δ U = -10.5 kJ… MHT CET Medical 2026500\ mL of nitrogen gas and 750\ mL hydrogen gas were allowed to react at 1\ bar pressure… MHT CET Medical 2026The relationship between Δ H and Δ U for the reaction, PCl_3(g) + Cl_2(g) arrow PCl_5(g)… MHT CET Medical 2026What would be the heat released in kJ when 450\ cm^3 of 0.02\ M\ H_2SO_4 is mixed with… MHT CET Medical 2026Identify from following reactions that it takes place with Δ H = Δ U . MHT CET Medical 2026Calculate the work done in the following reaction at 300\ K , A(g) + B(g) = 2C(g) [R =… MHT CET Medical 2026 Full Thermodynamics (C) list All AIIMS PYQs