Chem Essay

570 WordsJun 3, 20133 Pages
CHEM 10050 Problem Set #3 Name_________________ 1. Calculate the molarity of normal saline (0.90% w/w NaCl) given the density of this solution to be 1.05 g/ml. Assume 100 g solution. Then: [pic] [pic] [pic] [pic] 2. Calculate the molarity of an aqueous solution resulting when 275 ml of 3.15 M glucose is diluted with 150 ml of water. M1V1 = M2V2 Total volume = 275 ml + 150 ml = 425 ml 3.15 M x 275 ml = M2 x 425 ml [pic] 3. How many grams of sodium hydroxide are in 36.7 ml of 2.256 M sodium hydroxide? [pic] 4. What is the concentration of glucose in ppm in a 0.00025 M glucose solution? The density of this solution is 1.02 g/ml. [pic] [pic] [pic] [pic] 5. Draw reaction diagrams for endothermic and exothermic reactions. Label each axis, reactants, products, heat of reaction (ΔH), and energy of activation (Ea). Define heat of reaction and energy of activation. [pic][pic] 6. Given the following; [H2] = 0.00537, [HCl] = 0.0354, ΔH = -56.3 kJ, ΔG = +26.6 kJ; Calculate Keq for the following reaction: Al(s) + HCl(g) [pic] H2(g) + AlCl3(s) Balanced equation: 2Al(s) + 6HCl(g) [pic] 3H2(g) + 2AlCl3(s) [pic] a) Are the reactants or products favored at equilibrium? Explain. Products are favored at equilibrium. K is larger than 1. b) Is this reaction exergonic or endergonic? Explain. The reaction is endergonic (non-spontaneous). (G = (+) c) Is ΔS positive or negative for this reaction? Explain your answer. (S = (-). Eight (8) moles of reactants is producing five (5) moles of products. The system is becoming more organized. d) Predict the effects of the following on the equilibrium and K(eq): i. increase [H2] Equilibrium shifts left. Keq is constant. ii. decrease [HCl] Equilibrium shifts left. Keq is constant. iii. decrease pressure

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