Question: The enthalpy changes, ?H, for three reactions are given. H2(g)+1/2O2(g)?H2O(l) ?H=?286 kJ/mol Ca(s)+2H+(aq)?Ca2+(aq)+H2(g) ?H=?544 kJ/mol CaO(s)+2H+(aq)?Ca2+(aq)+H2O(l) ?H=?193 kJ/mol Using Hess's law, calculate the heat of

The enthalpy changes, ?H, for three reactions are given.

H2(g)+1/2O2(g)?H2O(l) ?H=?286 kJ/mol

Ca(s)+2H+(aq)?Ca2+(aq)+H2(g) ?H=?544 kJ/mol

CaO(s)+2H+(aq)?Ca2+(aq)+H2O(l) ?H=?193 kJ/mol

Using Hess's law, calculate the heat of formationfor CaO(s) using the reaction shown.

Ca(s)+1/2O2(g)?CaO(s)

?H=?kJ/mol

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Answer 1 H2g12O2gH2Ol H286 kJmol This reaction is an exothermic reaction as indicated by the negativ... View full answer

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