In the space provided below, write the balanced net ionic reaction equations fro

Question

In the space provided below, write the balanced net ionic reaction equations from the descriptions. Use the table of thermodynamic data in your text (or another approved resource) to calculate the molar enthalpy of the reactions. You will determine experimentally the enthalpy values of the last two reactions. In another piece of paper, arrange the six equations and their enthalpy values in such a way that when added algebraically they yield a seventh equation that describes the formation of solid ammonium chloride. Reaction 1: The enthalpy of formation of gaseous ammonia, NH_3. Reaction 2: The heat of solution of gaseous ammonia. Reaction 3: The enthalpy of formation of gaseous hydrogen chloride. Reaction 4: The heat of solution of gaseous hydrogen chloride. Reaction 5: The heat of reaction between an aqueous solution of hydrochloric acid with aqueous ammonia, NH_3, yielding aqueous ammonium chloride. Reaction 6: The heat of solution of solid ammonium chloride yielding aqueous ammonium chloride.

Explanation / Answer

Q1.

Enthalpy of formation of NH3:

1/2N2(g) + 3/2H2(g) --> NH3(g)

Q2.

Heat of solution of gas ammonia

NH3(g) --> NH3(aq)

also:

NH3(g) + H2O(l) --> NH4+(aq) + OH-(aq)

Q3.

Enthalpy of formation of Gas HCl

1/2H2(g) + 1/2Cl2(g) --> HCl(g)

Q4.

The heat of solutino of gas HCl

HCl(g) --> HCl(aq)

or

HCl(g) + H2O(l) --> Cl-(aq) + H3O+(aq)

Q5.

Heat of reaction of HCl and NH3 aq to NH4Cl

HCl(aq) + NH3(g)(aq) --> NH4+(aq) + Cl-(aq)

Q6.

heat of solution of solid NH4Cl and Aq NH4+

NH4Cl(s) + H2O(l) --> NH4+(aq) + Cl- + H2O(l)

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