| (i) \[{{H}^{+}}(aq)+O{{H}^{-}}(aq)\to {{H}_{2}}O(1),\]\[\Delta H=-{{X}_{1}}\,kJ\,mo{{l}^{-1}}\] |
| (ii) \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(1)\],\[\Delta H=-{{X}_{2}}\,kJ\,mo{{l}^{-1}}\] |
| (iii) \[C{{O}_{2}}(g)+{{H}_{2}}(g)\to CO(g)+{{H}_{2}}O,\]\[\Delta H=-{{X}_{3}}kJ\,mo{{l}^{-1}}\] |
| (iv) \[{{C}_{2}}{{H}_{2}}(g)+\frac{5}{2}{{O}_{2}}(g)\to 2C{{O}_{2}}(g)+{{H}_{2}}O(1),\]\[\Delta H=+\,\,4{{X}_{4}}kJ\,mo{{l}^{-1}}\] |
A) \[+\,{{X}_{3}}\,kJ\,mo{{l}^{-1}}\]
B) \[-\,{{X}_{4}}\,kJ\,mo{{l}^{-1}}\]
C) \[+\,{{X}_{1}}\,kJ\,mo{{l}^{-1}}\]
D) \[-\,{{X}_{2}}\,kJ\,mo{{l}^{-1}}\]
Correct Answer: D
Solution :
[d] This reaction shows the formation of \[{{H}_{2}}O\], and the \[{{X}_{2}}\] represents the enthalpy of formation of \[{{H}_{2}}O\] because as the definition suggests that the enthalpy of formation is the heat evolved or absorbed when one mole of substance is formed from its constituent atoms.
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