Question

i need help with both , thank you

CHEMI21 Quiz #5 Show your work and circle your answer. Name: 1. The reaction A+B → AB has a AH -130 kJ and an activation energy (E) of 50 kJ. Use this information to complete the following: a. On the back side, sketch the energy vs. progress of reaction graph approximately to scale. For full credit label the axes, reactants, products, activation energy, and AH on your graph. b. Write the reaction correctly showing the energy as a product or reactant. c. Is this an endothermic or exothermic reaction? d. If this reaction was carried out in a beaker, how would it feel? 2. Consider the reaction N2 (g) + H2(g) → NH; (g) a. Balance the reaction and write the equilibrium constant expression. b. If a 5.0 L flask contains 17 g of NH3, 14 g of N2, and 12 g of Hz, what is the value of Ke? c. What does the value of Key tell you about this equilibrium reaction?

Answer 1

Solution : (a) N Transition state reactants ΔΗ Potential Energy (KJ) Products Progress of reaction / time

(b) the reaction - A + B AB to sente Armention [Morodice theachion - 180 kJ Since in the above energy is released in giver reation, OH in negative which means that product formation. Thus, this is on exothermic reaction 2. ( since the of energy beaker. reaction is an exothermie tyke, so so due to the release the beaker would get heated if it was carried out in a 82 ca) the hat balanced equation for the given reaction is t N2 9 + 3H2(g) - 2NH3 (8) The expression for the egoilibrum content is given by - [N] TH₂33 B (6) Volume of the flask = 5.02 Given mans of NH3 = 179 = 179 - 1 mole of NH₃ 179 molt Given more of N₂ = 149 = 19g = a mole of N ₂ 19g molt Given mass of H2 = 12 - 12 = 6moles of H₂

Then, concentration of NH₃ = Concentration of N2 = Imole = 0.2 moles d 1 = [NH₂] 5L 1 mole = 0.2 miles I = [2] 5L 6meley = 1.2 moles 2 = [H₂] Concentration of H₂ = 52 then, keq = [NH₃] ² = [2] [H₂73 (0.2) ² = (0.2) (1.23 1.15 x 102 02 The value of keq indicates the extent broceed: - to which a reaction will If keg is a large number, it means that the equilibrium concentration of the products is large. In this case, the reaction coill proceed to the right resulting in an increase in the concentration of broducte. I Keq is a smalley number, it means that the equilibrium concentration of the prodets reactents is large. In this case, the reaction will broceed to the left resulting of in an increase in the concentration reactants. OD