Consider the following generic chemical equation whose AHrxn is unknown. Target: 2 A + 7 B 4X Instead, you are given two other equations for which the AHxn is known: 1) 4 C + 3 B → 2 X (AHXN = -1305 kJ) 2) C + X → A + B (AHxn = -205 kJ) %3D

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Calculate AH for the following chemical equation. If necessary, balance the chemical equations. rxn Fe(s) + CuCl₂ (s) → FeCl₂(s) + Cu(s) AH-[(-341.8kJ/mol) +0] --[0+ (-220.1kJ/mol)]- kJ/mol

Multiple Choice 1. When a match is lit, the air around the flame feels hot to the hand. Which statement best describes this observation? Heat is absorbed from the system, so it feels hotter. b. The reaction is endothermic. а. The potential energy of the match decreased. d. 3P6) + 10KCIO3 (5) → ЗРо + 10KCIO; (9) — с. 3P,O10 (9) + 10KCI + 9484 kJ 3P,O10 (6) AH = 3161 kJ/mol P е. (s) To answer questions 2 & 3, refer to the following information: A. synthesis reaction B. boiling a liquid C. subliming a solid D. dissolving a solute E. nuclear fission 2. Which of the following is always an example of an exothermic reaction? а. A d. D b. е. Е с. С 3. Which of the following would most likely have the smallest magnitude of enthalpy change? а. A d. B, C and D b. В е. А, В, С, D с. Е 4. How much energy is released when the temperature of 10.6 kg mass of a substance decreases by 15°C, if the substance has a specific heat of 1.6J/g°C? a. 0.10 kJ b. 0.25 kJ c. 0.51 kJ d. 1.0 x 10² kJ е. 250 k]

Write and balance the reaction for the complete combustion of ethane, C2H6. (Use the lowest possible coefficients.)

I did a lab in which I dissolved sodium bicarbonate and sodium acetate in water, using a simple styrofoam cup as a calorimeter. For sodium bicarbonate, the temperature decreased from 20.8 degrees Celsius to 16.6 degrees Celsius. For sodium acetate, the temperature decreased from 18.4 degrees Celsius to 17.5 degrees Celsius. I used 150 mL of water to dissolve sodium bicarbonate, and 32.5 mL of water to dissolve sodium acetate. I used 15 grams of sodium bicarbonate and 3.25 grams of sodium acetate. I calculated that -2.64 kJ was released in the reaction for sodium bicarbonate, and -0.122 kJ was released in the reaction for sodium acetate. I also calculated that 0.18 moles of sodium bicarbonate were used and 0.0396 moles of sodium acetate was used. I then got -14.67 kJ/mol as the molar heat of solution for sodium bicarbonate, and -3.08 kJ/mol for the molar heat of solution for sodium acetate. However, when I calculate the percent errors, I am getting numbers of over 100. Did I do…

What is AG rxn for the following reaction? 3NO2(g) + H₂O() → 2HNO3() + NO(g) Substance AGf (kJ/mol) H₂O(1) HNO3(1) NO(g) NO2(g) -237.2 -79.9 86.7 51.8

Heat of Neutralization Initial temp of HCI solution Initial temp of NaOH solution Average initial temperature Final temp of neutralized mixture Change in temperature QH₂0 for the reaction (get mass using 50.0 mL solution and d= 1.02 g/mL) AHSolution (eqn 4) AH per mole istem brs 1915w to studseqmet munditiup3 25.9°C 24.9 °C 25.4 °C (E 360 m °C to on aitoaga 10.6 °C 2289.708 1 -2259.708 1 kJ/mol