Question

Multiple Choice - Circle the correct answer below each question (3 points cach) 1. Which of the following would you expect to have the highest boiling point? a F b. CI: CBE c. All of the above have the same boiling point 2. For which one of the following reactions is AH run equal to the heat of formation of the product? a. N2(g) + 3H2(g) - 2NH; (g) b. %N () + O2(g) - NO: () c. 6C(s) + 6H() - C.H(1) d. P ) + 4H (g) + Br(g) - PH.Br (1) c. 12C (8) + TIH: (g) + 110(g) - CH2011 (8) 3. Ammonia and chlorine react to form nitrogen and hydrochloric acid. If you react 2.0 L of ammonia with 3.0 L of chlorine at constant temperature in a fixed volume container, what is the ratio of the final and initial pressures (Pria/Pinta? 2NH3(g) + 3Cl2 (g) → Nz (g) + 6HCI (8) a 0.71 b. 1.00 c. 1.40 d. 1.50 c. none of these 4. For which gas do the molecules have the smallest average kinetic energy at 25 °C and 1 atm? a. He b. CI: c. CHE 4, NH3 c. All gases have the same average kinetic energy and the sign of 5. A chemical reaction that emits heat to the surroundings is AH is a. Exothermic, positive b. Endothermic, positive c. Exothermic, negative d. Endothermic, negative e none of these

Answer 1

al] Explanation :- Intermolealer vander wall athracky & molarmus 2. b. Nr 9, +02 g > No2 g Explanats: Heat al fermetus is defened when one mole ala substane is made from its Constituent element and all measurements are made at 25°C and I atns Conditions. - 3. - 2003 gt 32 g N2 g +674g, 24 32 0 0 O 0 12 CL . Initial rolune, V,= 2+3=5 L final volume, V2 = 1+6=74 ² Pevi = ff Vz pt = h =$=071 7 Answer: Ta.0.71

4. e. All gases have the same average lenitie energy Explanaters : Average Kenitee energy is a . function aftemperature conly. c. exothermic, negatire лис s.