(ii) The value of the molar enthalpy of neutralization, for the reaction between HCl(aq) and ∆Hneut, NaOH(aq) (d) The student repeats the experiment with the same volumes as before, but this time uses 2.0 HCl and 2.0 NaOH. M M (i) Indicate whether the value of increases, decreases, or stays the same when compared to the first q experiment. Justify your prediction. (ii) Indicate whether the value of the molar enthalpy of neutralization, increases, decreases, or ∆Hneut, stays the same when compared to the first experiment. Justify your prediction. that a significant amount of heat were lost to the air during the experiment. What effect this have on the calculated value of the molar enthalpy of neutralization, Justify your answer. ∆Hneut? 15. Answer the following questions that relate to the chemistry of nitrogen. nitrogen atoms combine to form a nitrogen molecule, as represented by the following equation. 2 N(g) N2(g) Using the table of average bond energies below, determine the enthalpy change, for the reaction. ∆H, Bond Average Bond Energy (kJ mol–1) N–N 160 N=N 420 950 NN (b) The reaction between nitrogen and hydrogen to form ammonia is represented below. N2(g) + 3 H2(g) 2 NH3(g) = kJ  ∆H˚ –92.2 Predict the sign of the standard entropy change, for the reaction. Justify your answer. ∆S˚, value of for the reaction represented in part (b) is negative at low temperatures but positive at ∆G˚ high temperatures. Explain.
(ii) The value of the molar enthalpy of neutralization, ∆Hneut, for the reaction between HCl(aq) and NaOH(aq) (d) The student repeats the experiment with the same volumes as before, but this time uses 2.0 M HCl and 2.0 M NaOH. (i) Indicate whether the value of q increases, decreases, or stays the same when compared to the first experiment. Justify your prediction. (ii) Indicate whether the value of the molar enthalpy of neutralization, ∆Hneut, increases, decreases, or stays the same when compared to the first experiment. Justify your prediction. that a significant amount of heat were lost to the air during the experiment. What effect this have on the calculated value of the molar enthalpy of neutralization, ∆Hneut? Justify your answer. 15. Answer the following questions that relate to the chemistry of nitrogen. nitrogen atoms combine to form a nitrogen molecule, as represented by the following equation. 2 N(g) N2(g) Using the table of average bond energies below, determine the enthalpy change, ∆H, for the reaction. Bond Average Bond Energy (kJ mol–1) N–N 160 N=N 420 NN 950 (b) The reaction between nitrogen and hydrogen to form ammonia is represented below. N2(g) + 3 H2(g)  2 NH3(g) ∆H˚ = –92.2 kJ Predict the sign of the standard entropy change, ∆S˚, for the reaction. Justify your answer. value of ∆G˚ for the reaction represented in part (b) is negative at low temperatures but positive at high temperatures. Explain.
unit_9_thermo_class_packet.docx