AP EAMCET · Chemistry · Thermodynamics (C)
Enthalpy of formation of \(\mathrm{CO}(g), \mathrm{CO}_2(g), \mathrm{N}_2 \mathrm{O}(g)\) and \(\mathrm{N}_2 \mathrm{O}_4(g)\) are \(-110,-393,81,9.7 \mathrm{~kJ} \mathrm{~mol}^{-1}\) respectively. Calculate \(\Delta_r H\) for the following reaction.
\[
\mathrm{N}_2 \mathrm{O}_4(g)+3 \mathrm{CQ}(g) \longrightarrow \mathrm{N}_2 \mathrm{O}(g)+3 \mathrm{CO}_2(g)
\]
- A \(-569 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- B \(+569 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- C \(+778 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- D \(-778 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Answer & Solution
Correct Answer
(D) \(-778 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Step-by-step Solution
Detailed explanation
Given, Enthalpy of formation of \(\mathrm{CO}(g)=-110 \mathrm{~kJ} \mathrm{~mol}^{-1}\) Enthalpy of formation of \(\mathrm{CO}_2(g)=-393 \mathrm{~kJ} \mathrm{~mol}^{-1}\) Enthalpy of formation of \(\mathrm{N}_2 \mathrm{O}(g)=81 \mathrm{~kJ} \mathrm{~mol}^{-1}\) Enthalpy of…
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