| Consider the following reactions: [AIPMT (S) 2007] |
| (i) \[{{H}^{+}}(aq)+O{{H}^{-}}(aq)={{H}_{2}}O(l)\]\[\Delta H=-{{x}_{1}}\,kJ\,mo{{l}^{-1}}\] |
| (ii) \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)={{H}_{2}}O(l)\]\[\Delta H=-{{x}_{2}}\,kJ\,mo{{l}^{-1}}\] |
| (iii) \[C{{O}_{2}}(g)+{{H}_{2}}(g)=CO(g)+{{H}_{2}}O(l)\]\[-{{x}_{3}}\,kJ\,mo{{l}^{-1}}\] |
(iv)  \[+{{x}_{4}}\,kJ\,mo{{l}^{-1}}\] |
| Enthalpy of formation of \[{{H}_{2}}O(l)\] is: |
A) \[-{{x}_{2}}\,kJ\,mo{{l}^{-1}}\]
B) \[+{{x}_{3}}\,kJ\,mo{{l}^{-1}}\]
C) \[-{{x}_{4}}\,kJ\,mo{{l}^{-1}}\]
D) \[-{{x}_{1}}\,kJ\,mo{{l}^{-1}}\]
Correct Answer: A
Solution :
| Enthalpy of formation: The amount of heat evolved or absorbed during the formation of 1 mole of a compound from its constituent elements is known as heat of formation. So, the correct answer is: |
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