कार्बन से कार्बन डाईऑक्साइड के लिये दहन ऊप्मा \(-393.5\, kJ / mol\) है। कार्बन एवं ऑक्सीजन से \(35.2\, g\) बनने पर उत्सजिर्जित ऊप्मा है

A \(+ 315\, kJ\)
B \(- 630\, kJ\)
C \(- 3.15\,kJ\)
D एक पण नहीं

Verified Solution

Answer & Solution

Correct Answer

(D) एक पण नहीं

Step-by-step Solution

Detailed explanation

Formation of \(\mathrm{CO}_{2}\) from carbon and dioxygen gas can be represented as: \(\mathrm{C}_{\mathrm{(s)}}+\mathrm{O}_{2(\mathrm{g})} \longrightarrow \mathrm{CO}_{2(\mathrm{g})} \quad \Delta_{f} H=-393.5 \;\mathrm{kJ}\, \mathrm{mol}^{-1}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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