A) \[105,700\,\,cal\]
B) \[61,000\,\,cal\]
C) \[105,000\,\,cal\]
D) \[62,300\,\,cal\]
Correct Answer: D
Solution :
Key Idea: Use Hesse's law Given\[Zn+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}ZnO+84000\,\,cal\] \[Hg+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}HgO+21,700\,\,cal\] \[Zn+HgO\xrightarrow{{}}Hg+ZnO+\]heat \[\frac{1}{2}O\,\,Zn\xrightarrow[{}]{{}}ZnO+84,000\,\,cal\] \[HgO\xrightarrow{{}}Hg+\frac{1}{2}{{O}_{2}}-21,000\,\,cal\] \[\overline{Zn+HgO\xrightarrow{{}}ZnO+Hg+62,300\,\,cal}\] \[\therefore \]Heat in reaction\[=+62300\,\,cal\].
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