AP EAMCET · Chemistry · Thermodynamics (C)
A, B, C and D are some compounds. The enthalpy of formation of \(\mathrm{A}(\mathrm{g}), \mathrm{B}(\mathrm{g}), \mathrm{C}(\mathrm{g})\) and \(\mathrm{D}(\mathrm{g})\) is \(9.7,-110,81\) and \(-393 \mathrm{~kJ} \mathrm{~mol}^{-1}\) respectively. What is \(\Delta r \mathrm{H}\left(\right.\) in \(\left.\mathrm{kJ} \mathrm{mol}^{-1}\right)\) for the given reaction?
\(\mathrm{A}(\mathrm{~g})+3 \mathrm{~B}(\mathrm{~g}) \longrightarrow \mathrm{C}(\mathrm{~g})+3 \mathrm{D}(\mathrm{~g})\)
- A -777.7
- B 777.7
- C -1418.3
- D 1418.3
Answer & Solution
Correct Answer
(A) -777.7
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