When 185 G of HgO(s)is Decomposed to Form Hg(l)and O₂(g), 7

question 95

Multiple Choice

When 18.5 g of HgO(s) is decomposed to form Hg(l) and O₂(g) , 7.75 kJ of heat is absorbed at standard-state conditions.What is the standard enthalpy of formation ( $\Delta$ H°_f) of HgO(s) ?

• A)-90.7 kJ/mol
• B)-7.75 kJ/mol
• C)0.419 kJ/mol
• D)27.9 kJ/mol
• E)143 kJ/mol

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