Chemical Thermodynamics Question 168

Question: Thermochemical reactions $ C(graphite)+\frac{1}{2}O_2(g)\to CO(g);,\Delta H=-110.5,kJ $

$ CO(g)+\frac{1}{2}O_2(g)\to CO_2(g);,\Delta H=-283.2,kJ $ From the above reaction, the heat of reaction for $ C(graphite)+O_2(g)\to CO_2(g) $ will be [CPMT 1988; MP PMT 1989]

Options:

A) - 393.7 kJ

B) + 393.7 kJ

C) - 172.7 kJ

D) + 172.7 kJ

Show Answer

Answer:

Correct Answer: A

Solution:

eq. (i ) + eq. (ii ) gives the required result.



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