Chemical Thermodynamics Question 260

Question: Given that $ C(s)+O_2(g)\to CO_2(g),\Delta H=-394kJ $

$ 2H_2(g)+O_2(g)\to 2H_2O(l),,\Delta H=568kJ $

$ CH_4(g)+2O_2(g)\to CO_2(g)+2H_2O(l) $

$ \Delta H=-892,kJ $ Heat of formation of $ CH_4 $ is [DCE 1999]

Options:

A) - 70 kJ

B) 71.8 kJ

C) - 244 kJ

D) + 782 kJ

Show Answer

Answer:

Correct Answer: A

Solution:

$ C+O_2\to CO_2,\Delta H=-394,kJ $ -..(i) $ 2H_2+O_2\to 2H_2O,,\Delta H=-568,kJ $ -.(ii) $ CH_4+2O_2\to CO_2+2H_2O,,\Delta H=-892,kJ $ -..(iii) (i) + (ii) - (iii) and find the required result.



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