JEE Main & Advanced
Chemistry
Thermodynamics / रासायनिक उष्मागतिकी
Question Bank
Heat of reaction
question_answer
If \[C+{{O}_{2}}\to C{{O}_{2}}+94.2\,kcal\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to \,{{H}_{2}}O+68.3\,kcal\] \[C{{H}_{4}}+2{{O}_{2}}\,\to \,C{{O}_{2}}+2{{H}_{2}}O+210.8\,kcal\] Then the possible heat of methane will be [UPSEAT 2001]
A) 47.3 kcal
B) 20.0 kcal
C) 45.9 kcal
D) ? 47.3 kcal
Correct Answer:
B
Solution :
By 2 × (i) + (ii) ? (iii) \[\Delta H\]of methane \[=20.0\,kcal\].