Multiple Select QuestionSelect all that applyWhich of the following reactions are exothermic? Choose all that apply.Multiple select question.2 NH3(g) → 3 H2(g) + N2(g)      ΔH = +22.0 kcal/molCH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)     ΔH = -213 kcal/molC6H12O6(s) → 2 C2H6O(l) + 2 CO2(g)     ΔH = -16 kcal/mol

Label each of the following as being an example of an endothermic or an exothermic reaction.a. a reaction where the surroundings decrease in temperature from 25 oC to 19 oC  Blank 1 Question 26b. N2(g)  +  3 H2(g)  -->  2 NH3(g)    ΔH = -92.4 kJ

Given the following reactions and their respective ∆H values:1. 2H₂(g) + O₂(g) → 2H₂O(l); ∆H = -572.3 kJ2. N₂(g) + 3H₂(g) → 2NH₃ (g); ∆H = -91.8 kJWhat is the ∆H for the reaction: N₂(g) + 3H₂(g) → 2NH₃ (g) + 2O₂(g)?Select one:a.-755.9 kJb.755.9 kJc.-664.1 kJd.664.1 kJ

Which of the following are exothermic reactions? 1(i) CaO + H2O  Ca(OH)2(ii) 2Pb(NO3)2Heat 2PbO + 4NO2 + O2(iii) CaCO3Heat CaO + CO2(iv) CH4 + 2O2  CO2 + 2H2O(A) (i) and (ii) (B) (ii) and (iii)(C) (i) and (iv) (D) (ii) and (iv)

Identify the letter that best completes the statement or answers the question by circling or highlighting the ONE correct letter. (5 marks) 6. A chemical system in which ONLY energy can flow into or out of a system is described as a. a closed system d. a chemical system b. an open system e. none of the above c. an isolated system 7. The decomposition of ammonia into hydrogen and nitrogen gas has a molar enthalpy of reaction of +45.9 kJ/mol of ammonia. Which of the following would be the CORRECT thermochemical equation to represent this reaction. 2NH3(g) N2(g) + 3H2(g) + 45.9 kJ 2NH3(g) + 45.9 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) + 91.8 kJ 2NH3(g) + 91.8 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) ∆HRx = -45.9 kJ/mol NH3 8. Using the enthalpies of formation, what is the enthalpy change for the following reaction? CO2(g) → CO(g) + 1/2 O2(g) a. –283 kJ d. +506 kJ b. +283 kJ e. None of the above c. -506 kJ 9. Using the following thermochemical data: 1. C2H2(g) + 5/2 O2(g) → 2CO2(g) + H2O(l) ΔH = –1.30 × 103 kJ 2. C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(l) ΔH = –1.56 × 103 kJ 3. H2(g) + 1/2 O2(g) → H2O(l) ΔH = –2.86 × 102 kJ What is ∆H for the following reaction? C2H6(g) → C2H2(g) + 2H2(g) a. -2.60 x 101 kJ d. -5.46 x 103 kJ b. -3.12 x 102 kJ e. 2.60 x 101 kJ c. +3.12 x 102 kJ f. none of the above 10. For the following reaction, the rate of consumption of Al(s) is -2.0 mol/L s. The rate of production of Na would be: ? a. 2 mol/Ls d. 18 mol/Ls b. 6 mol/Ls e. not enough information is given c. 9 mol/Ls f. none of the above

Which of the following processes is/are exothermic?(1) I2(l) ⟶⟶ I2(s)(2) Cl(g) + e− ⟶⟶ Cl−(g)(3) Na(g) ⟶⟶ Na+(g) + e−(4) H(g) + Cl(g) ⟶⟶ HCl(g) (1), (2), and (3) (4) only (2) and (4) (1) and (3) (1), (2) and (4)