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.
