Chemical Thermodynamics Question 220

Question: $ C $ (diamond) $ +C_2(g)\to CO_2(g);,\Delta H=-395 $ kJ $ C $ (graphite) $ +O_2(g)\to CO_2(g);,\Delta H=-393.5 $ kJ From the data, the $ \Delta H $ when diamond is formed from graphite, is [CBSE PMT 1989; BHU 1987]

Options:

A) $ -1.5,kJ $

B) $ +,1.5,kJ $

C) $ +,3.0,kJ $

D) $ -3.0,kJ $

Show Answer

Answer:

Correct Answer: B

Solution:

Aim: $ {C_{\text{(graphite)}}}\to {C_{\text{(diamond)}}} $ ; eq. (i) - (ii) gives the result.



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