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
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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 formationfor CaO(s) using the reaction shown.
Ca(s)+1/2O2(g)?CaO(s)
?H=?kJ/mol
Expert Answer:
Answer 1 H2g12O2gH2Ol H286 kJmol This reaction is an exothermic reaction as indicated by the negativ... View the full answer
Related Book For 
Chemistry The Central Science
ISBN: 978-0321696724
12th edition
Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward
Posted Date:
