Chemical Thermodynamics Question 89

Question: If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of $ C-C $ bond is [UPSEAT 2003]

Options:

A) 80 calories

B) 40 calories

C) 60 calories

D) 120 calories

Show Answer

Answer:

Correct Answer: B

Solution:

$ CH_4\to C+4H,\Delta H=320 $

$ {E_{C-H}}=90,cal $

$ C_2H_6\to 2C+6H,,\Delta H=360 $

$ \therefore 360={E_{C-C}}+6{E_{C-H}} $

$ \therefore {E_{C-C}}=360-320=40cal $ .



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