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

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