please check my work. did i do this assignment correct? if not can you point out what i did wrong? thank you.

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: Please Check My Work Did I Do This Assignment Correct If Not Can You Point Out What I Did Wrong Thank You 1 (79.45 KiB) Viewed 104 times

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Prelab Assignment: Calorimetry and Hess's Law fe 552 1. Show your work for all calculations. When 1.104 grams of iron metal are mixed with an 1104, excess of 26.023 grams of hydrochloric acid in a coffee cup calorimeter, the solution 2 - temperature rises from 25.2 °C to a maximum of 33.5 °C. afe + 6HCl FeCl₃ + 3H2 26.623 a) Is this reaction exothermic or endothermic? Explain. This is an exothermic reaction because the reaction releases heat. The heat rises and is then released Hot - 4.3 b) Calculate the amount of heat (in J) absorbed by the solution. Assume that the solution Fe 1.104 ) mass equals the combined mass of the reactants, and that the specific heat capacity of the solution is the same as the specific heat capacity of water, c = (4.184 J/g °C) MC 2.250) mass: 27. 127g 125.2c c = 4,184 J/g co 2527 T 35.Sc -q=nCAT 9 = 942.045 C) How much heat (in J) was released by the reaction that occurred? -9rxn = + 9 mixture -9=27.1a7g ( 4,1845|pje) (33.5y asa (0 942.04 J d) At constant pressure, the heat of reaction equals the reaction enthalpy. Also, the heat of reaction (defined as absorbed heat) has the same magnitude and opposite sign of the heat released by the reaction, which is equal to the heat absorbed by the solution: AHraction = reaction = released = Gohaton Calculate reaction in kilojoules per mole of metal used (kJ/mol). Imilere 942 KJ te 55.845460 -219769 mil = .01946 9 moles re 10104 g 47.65 kJ/ e) Write the balanced thermochemical equation for the reaction between iron and hydrochloric acid. Include AHraction in kilojoules (kJ). The products of the reaction are aqueous iron(III) chloride and hydrogen gas. afes+ 6HCl(a) - 2 Fe Ciscopt 3H2(g) Al reaction 95.2 kJ/mol Because fe is limiting 47.6 x 2 = Calorimetry and Hess's Law hole Page 1 of 2

H 2. Consider the following three reactions: 2 Fe (s) + 6 HCI (aq) - 2 Feb (aq) + 3H2(g) FeO, (s) + 6HCl (aq) - 2 FeCl (aq) + 3HO () Hz = 2 Hz (9) + O2(g) → 2H20 () H Show how these equations must be manipulated and summed together according to Hess's Law to determine AH for the combustion of iron (target equation shown below) Fe (s) + O2(g) Fe 03 () HE? .. - 11 afe +6 telafell3 + 3 H₂ 2xet 3+ 3 H20 D Feeds toilet reversed Ź are + 3 H₂O - Fe2O3 + 3H2 3 [altat on 2H2O - Hy = 3. 34 = 4 360 h fez O₂ + 3 24 +302 Hs = 9 fet 3+%402D & tho fe + / 0₂ D " . Fee Oz AH = -9% % 3. Express the enthalpy of combustion of iron in terms of the enthalpy of formation of iron (III) oxide. fe + % 0 a fee Oz AH = -9% Calorimetry and Hess's Law Page 2 of 2