Question

Consider the following double replacement reaction between silver nitrate and sodium chloride: AgNO_3(aq) + NaCl(aq) → AgCl(s) + NaNO_3(aq) \DeltaH^{\circ}_{rxn} Which of the following is the correct expression needed to calculate\DeltaH^{\circ}_{rxn}?

Answer 1

The question is not complete. Proposed completed question is:

When aqueous solutions of sodium chloride and silver nitrate are mixed, a double-displacement reaction occurs.  What is the balanced equation for the reaction?

               A.  

NaCl(aq) + AgNO3(aq) --------NaNO3(aq) + AgCl(aq)

               B.  

NaCl(aq) + AgNO3(aq) -------- NaNO3(aq) + 3AgCl(s)

               C.  

NaCl(aq) + AgNO3(aq) --------- NaNO3(aq) + AgCl(s)

               D.  

NaCl(aq) + AgNO3(aq) --------- Na(s) + AgNO3Cl(aq)

               E.  

NaCl(aq) + AgNO3(aq) --------- NaNO3(aq) + ClAg(s)

Answer is

       A.  

NaCl(aq) + AgNO3(aq) --------NaNO3(aq) + AgCl(aq)

Explanation:

Following the law of conservation of energy, the total number of atoms in the reactant  side is equal to the total number of atoms in the product side.