Chemical Thermodynamics Question 220

Question: C (diamond) +C2(g)CO2(g);,ΔH=395 kJ C (graphite) +O2(g)CO2(g);,ΔH=393.5 kJ From the data, the ΔH 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(graphite)C(diamond) ; eq. (i) - (ii) gives the result.



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