`Delta H_f^o` of `HgO` (s) is `20` kcal/mol. The mass (in gm) of mercury, which can be liberated if `800` cal of heat is

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Q 2688823707.     `Delta H_f^o` of `HgO` (s) is `20` kcal/mol. The mass (in gm) of mercury, which can be liberated if `800` cal of heat is given to excess of `HgO` (s) is :

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