Chemical Thermodynamics Question 310
Question: If (i) $ C+O_2\to CO_2 $ , (ii) $ C+1/2O_2\to CO $ , (iii) $ CO+1/2O_2\to CO_2 $ , the heats of reaction are $ Q,,-12,,-10 $ respectively. Then $ Q= $ [Orissa JEE 2004]
Options:
A) - 2
B) 2
C) - 22
D) - 16
Show Answer
Answer:
Correct Answer: C
Solution:
$ C+O_2\to CO_2 $ ; $ \Delta H=q $
$ C+1/2O_2\to CO $ ; $ \Delta H=-12 $ -..(i) $ CO+1/2O_2\to CO_2 $ ; $ \Delta H=-10 $ -..(ii) adding equation (i) and (ii) we can get $ \Delta H=-12+(-10)=-22 $
