Question

1. Calculate the heat loss or heat gain of the 3 solution mixtures (q_rxn). Then calculate the ΔH f or each reaction. Write the calculations on a sheet of paper showing all of your work.
2. Use Hess’s law and your determination of ΔH for the first 2 reactions to determine ΔH for the third reaction: NH3 + HCl → NH4Cl
3. Compare the result s of question 3 with the experimental results of the reaction: NH3 + HCl → NH4Cl (calculate the percent error)

4. Initial Temperature of NaOH (°C)	23.2
   Initial Temperature of HCl (°C)	24.4
   Average Initial Temperature of Two Separate Solutions (°C)	23.7
   Highest Temperature of Mixture (May Be Extrapolated from Graph) (°C)	35.3
   Change in Temperature of Mixture (°C), ΔT	11.6

   Data Table 2: Temperature of Solution Every 20 Seconds

   Time after mixing (min:sec)	Temperature (°C)
   Initial	34.1
   0:20	35.3
   0:40	35.4
   1:00	35.3
   1:20	34.8
   1:40	34.8
   2:00	34.7
   2:20	34.5
   2:40	34.5
   3:00	34.1
   3:20	33.8
   3:40	33.7
   4:00	33.3
   4:20	33.1
   4:40	32.7
   5:00	32.6 Temperature (°C) of the Solution: NaOH+NH4Cl Initial Temperature of NaOH (°C) 24.6 Initial Temperature of NH4Cl(°C) 26.1 Average Initial Temperature of Two Separate Solutions (°C) 25.4 Highest Temperature of Mixture (May Be Extrapolated from Graph) (°C) 28.6 Change in Temperature of Mixture (°C), ΔT 3.2 Temperature of Solution Every 20 Seconds Time after mixing (min:sec) Temperature (°C) Initial 28.6 0:20 27.0 0:40 26.5 1:00 26.2 1:20 26.0 1:40 25.7 2:00 25.5 2:20 25.5 2:40 25.3 3:00 25.2 3:20 25.2 3:40 25.1 4:00 25.1 4:20 24.9 4:40 24.8 5:00 24.8 Temperature (°C) of the Solution (NH4Cl+HCl) Initial Temperature of NH4Cl(°C) 25.2 Initial Temperature of HCl (°C) 26.2 Average Initial Temperature of Two Separate Solutions (°C) 25.7 Highest Temperature of Mixture (May Be Extrapolated from Graph) (°C) 33.9 Change in Temperature of Mixture (°C), ΔT 8.2 Temperature of Solution Every 20 Seconds Time after mixing (min:sec) Temperature (°C) Initial 31.7 0:20 32.4 0:40 33.2 1:00 33.9 1:20 33.9 1:40 33.8 2:00 33.4 2:20 33.3 2:40 33.1 3:00 32.7 3:20 32.3 3:40 32.2 4:00 32.1 4:20 32.0 4:40 31.7 5:00 31.4