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

यदि इथेन, हाइड्रोजन तथा ग्रेफाइट की दहन उष्मायें क्रमशः \(-1560,-393.5\) तथा \(-286 \,kJ / mol\) है, तो इथेन की मानक संभवन ऊष्मा \(\left(\Delta_{f} H _{298}^{0}\right)\) है ............. |

  1. A \(-172.5\)
  2. B \(-192.5\)
  3. C \(-202.5\)
  4. D \(-162\)
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Answer & Solution

Correct Answer

(B) \(-192.5\)

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\(2 \mathrm{C}(\text { graphite })+3 \mathrm{H}_{2}(\mathrm{g}) \longrightarrow \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{g})\)…
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