Description 1. Consider the dissolving of ammonium nitrate, NH4NO3 (s), for which ?H° = +25.3 kJ/mol. If 133 grams of ammonium nitrate are dissolved in 367 grams of water, and the initial temperature is 25.0°C, what will be the final temperature of the system? You should assume that the specific heat of the entire system (the ammonium nitrate and water combined) is 4.18 J/g°C. 2. Citric acid, represented by H3Cit, is a triprotic acid. A student mixes together the following solutions in a styrofoam coffee cup: • 5.00 mL of 0.64 M citric acid • 45.00 mL of 0.77 M NaOH The two solutions start at a temperature of 25.5°C, and reach a final temperature of 27.8°C. The final, combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is transferred to the cup or surroundings. a) Write a complete, balanced equation for the neutralization of citric acid (H3Cit) and NaOH. b) Determine the total heat absorbed by the solution during this reaction. c) Calculate the number of moles of citric acid that reacted. d) Calculate the enthalpy of reaction, ?H, for this reaction in kJ/mol. Is the reaction exothermic or endothermic? 3. a) Using only the following information: • ?H°f for NO (g) is +90.4 kJ/mol • ?H° = –56.6 kJ/mol for the reaction: NO (g) + 1/2 O2 (g) à NO2 (g) Determine ?H°f for NO2 (g). b) Using only your answer to (a) and the following information: •?H° = –283.0 kJ/mol for the reaction: CO (g) + 1/2 O2 (g) à CO2 (g) Determine ?H° for the reaction: 4 CO (g) + 2 NO2 (g) à 4 CO2 (g) + N2 (g) c) A 10.0-L vessel contains 5.0 atm of CO and 3.0 atm of NO2 at 25°C. How much heat (in Joules) will be liberated if this is allowed to react to completion according to the reaction in part (b)? d) In a separate experiment using a very large reaction vessel with a movable piston, 6.00 moles of CO2 (g) reacts completely with 3.00 moles of nitrogen gas according to the following equation at 25°C and with a constant external pressure of 2.00 atm: 4 CO2 (g) + N2 (g) à 4 CO (g) + 2 NO2 (g) This reaction proceeds to completion. Calculate ?U, q, and w for this reaction under these conditions. 4. Given 100 g of hot tea at 90°C, what mass of ice at –10°C must be added in order to obtain a final temperature of 10°C? Useful Info: specific heat of ice = 2.09 J/g°C specific heat of tea = specific heat of liquid water = 4.18 J/g°C normal freezing point of water = 0°C normal boiling point of water = 100°C ?H° = +6.01 kJ/mol for the melting of ice: H2O (s) ? H2O (l) Note: This problem is very similar to a problem in the Practice Problems. But watch out—it is not identical!
Description All the observable changes you see when matter changes phase—the bubbles during boiling, the crystallization during freezing, and the “disappearing” of matter during evaporation—can can be explained at the particle level. Use your understanding of kinetic molecular theory and phase changes to complete the following assignment. Use paper, pencil, and a scanner to create particle-level diagrams showing the particle’s relationship to other particles according to the phase they are in for two of the following three situations: bubbles of gas form as pasta water begins to boil on the stove a refreshing drink contains both ice cubes and water freeze-drying technology dehydrates foods through sublimation Clearly label which two situations you are depicting and include a paragraph (three to five sentences long) explanation to accompany each drawing.
Description Hi, I have done an experiment called "Chemical Equilibrium and Le Chatelier’s Principle" . I have collected all needed data. Moreover, I have upload them in here. I need you to read the file called "Chemical Equilibrium and Le Chatelier’s Principle" and do what is exactly asking you for. the Zip file called data is the data that i have collected. The zip file called " exp " is the experiment note if you need to understand something use it. it is just for your extra help.
Description In this lesson, you learned about Oxidizing and Reducing Agents. Now, you will demonstrate your understanding of these agents by responding to the following question. Your response should be no less than 5 full sentences (a full paragraph in length), and should include relevant details. In general, where in the periodic table are the elements found that in elemental form are the strongest oxidizing agents? Explain. YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET.
Description There is a total of five questions all pertaining to different parts of chemistry. All work must be 100% original and all parts of the question must be answered.
Description In this lesson, you learned about factors that can influence reaction rates, as well as how concentration and reaction rate are related. To show what you learned in this lesson, complete the mathematical problems below. Make sure to show your work The rate law for a reaction is found to be rate = k[X]4. By what factor does the rate increase if [X] is doubled? The rate of a hypothetical reaction involving L and M is found to triple when the concentration of L is doubled and to double when the concentration of M is doubled. Write the rate law for this reaction. "Make sure to show your work, and your answers should be provided with the correct amount of significant figures." YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET.
