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JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry

\(Al _{2} O _{3}\) तथा \(CaO\) के लिए मानक निर्माण ऐन्थैल्पी क्रमशः \(1675 \,kJ\, mol ^{-1}\) तथा \(-635 \,kJ\, mol ^{-1}\) है। अभिक्रिया \(3 CaO +2 Al \rightarrow 3 Ca + Al _{2} O _{3}\) के लिए मानक अभिक्रिया ऐन्थैल्पी \(\Delta_{ r } H ^{0}=\) \(kJ\) है। (निकटतम पूर्णांक में)

  1. A \(220\)
  2. B \(240\)
  3. C \(230\)
  4. D \(250\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(230\)

Step-by-step Solution

Detailed explanation

Given reaction: \(3 CaO + Al \rightarrow Al _{2} O _{3}+3 Ca\) Now, \(\Delta_{ r } H ^{\circ}=\Sigma \Delta_{ f } H _{\text {Products }}^{\circ}-\Sigma \Delta_{ f } H _{\text {Reactants }}^{\circ}\) \(=[1 \times(-1675)+3 \times 0]-[3 \times(-635)+2 \times 0]\)…
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