full data please help this is my last lab ! (enthalpy change for the decompositi

Question

full data please help this is my last lab !

(enthalpy change for the decomposition of ammonium chloride)

1. Write out the reaction NH4Cl(s) -> NH3 (g) + HCl(g) as a series of steps which include the reactions observed in Procedures 2 and 3.

Use the known enthalpies for the change of state of NH3 and Hcl, given below.
NH3 (g) -> NH3 (aq) (?H = -34,640 J/mol)
HCl (g) -> HCl (aq) (?H = -75,140 J/mol)

Be sure to show how the reaction steps must proceed so that ? H for the desired reaction can be calculated. And be careful to use the positive or negative enthalpy values depending on the direction of the reactions that you add together.

Record the following initial conditions: Volume of cold water in the calorimeter (mL): 50mL Mass of water (density = 1g/mL): 50g Initial temperature (C) : 21.5C

Explanation / Answer

From Procedure(1)
NH3 (g) -> NH3 (aq) (DH = -34,640 J/mol)
HCl (g) -> HCl (aq) (DH = -75,140 J/mol)

Multiplying -1 to above reactions,
NH3 (aq) -> NH3 (g) (DH1 = 34,640 J/mol)
HCl (aq) -> HCl (g) ( DH2 = 75,140 J/mol)

From Procedure (3)
NH4Cl(s) -> NH3 (aq) + HCl(aq) (DH3= )

Final enthalpy calculation:
NH4Cl(s) -> NH3 (g) + HCl(g); DH
can be obtained by adding DH = DH1+DH2+DH3

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