11th Class
Physics
Thermodynamical Processes
Question Bank
Critical Thinking
question_answer
The \[{{H}_{2}}O(g)\] molecule dissociates as (i) \[{{H}_{2}}O(g)\to H(g)+OH(g);\,\Delta H=490\,kJ\] (ii) \[OH(g)\to H(g)+O(g);\,\Delta H=424\,kJ\] The average bond energy (in kJ) for water is
A) 490
B) 424
C) 914
D) 914/2
Correct Answer:
D
Solution :
eq. (i) + eq. (ii) find the required result and divide by 2.