AP EAMCET · Chemistry · Thermodynamics (C)
Use the data from table to estimate the enthalpy of formation of \(\mathrm{CH}_3 \mathrm{CHO}\).
- A \(-200 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- B \(-400 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- C \(-350 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
- D \(-150 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Answer & Solution
Correct Answer
(A) \(-200 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Step-by-step Solution
Detailed explanation
\(2 \mathrm{C}+2 \mathrm{H}_2+\frac{1}{2} \mathrm{O}_2 \longrightarrow \mathrm{CH}_3 \mathrm{CHO}\) \(\Delta H_f=\Sigma \mathrm{BE}_{\text {(reactants) }}-\Sigma \mathrm{BE}_{\text {(products) }}\) \(=2450-2650\) \(=-200 \mathrm{~kJ} / \mathrm{mol}\)
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