4. Ms. Prohaska is trying to determine the enthalpy of combustion for propan-2-ol. She heats up a sampleof water by burning the propan-2-ol in an alcohol burner, as represented below. The alcohol burneruses a wick to draw liquid up into the flame. The mass of the propan-2-ol combusted is determined bymeasuring the mass of the alcohol burner before and after combustion.-WaterWick-Water-C,H,OH(I)InitialFinalC,H,OH()When Ms. Prohaska does the same experiment for trial two, she uses the same mass of water and thesame initial temperature of water. However, she uses an alcohol burner that contains propan-2-ol thatis contaminated with water (which can dissolve in propan-2-ol). The difference in mass before andafter the combustion is the same as in trial one.Do you think the final temperature of the water in the beaker heated by the contaminated alcoholburner be greater than, less than, or equal to the final temperature of the water in the beaker in thefirst trial? Justify your answer

Step 1: Step 2: Step 3: Step 4:

Answered: 4. Ms. Prohaska is trying to determine…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to Thermometer measure the energy of a solution phase reaction. Stirring rod A student heats 65.13 grams of copper to 98.95 °C and then drops it into a cup containing 84.76 grams of water at 23.02 °C. She measures the final temperature to be 27.86 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.60 J/°C. Water- Assuming that no heat is lost to the surroundings calculate the specific heat of copper. Metal sample Specific Heat (Cu) = J/g°C. 2000 Thomson-BrooksCole
If 0.24 mols of substance B is able to produce 137J of heat. What is the change in reaction enthalpy in J associated with the following balanced reaction. (Hint: *pay attention the the coefficient for substances B *determine the sign for heat, is it + or -). Round and report your answer to an integer without decimal place including + or- - sign. Only enter numeric value, no unit. A+2B → AB2 + heat AHren =???
3. During the experiment, when calculating AH using the formula AH=C x AT, can we calculate the AH without measuring the amount of water that we put inside the calorimeter? Explain why or why not. (max of 5 sentences) 4. You accidentally forgot to measure the mass of the octane that you transferred in the crucible. You already started the calorimeter and it is too late to stop the equipment. Is it still possible to calculate the energy (in Joules) of octane? Explain.(max of 2 sentences)
3.
A certain chemical reaction releases 13.4/kJg of heat for each gram of reactant consumed. How can you calculate the heat produced by the consumption of 3.2kg of reactant? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Use the References to access important values if needed for this question Ethanol, C2H0, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol. Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to bum more efficiently in internal combustion engines. The combustion enthalpy of ethanol is 1366.9 kJ/mol The combustion enthalpy of 2-methylpentane, C6H14 is 4.157x103 kJ/mol. Calculate the energy released during the complete combustion of 382 g 2-methylpentane kJ Assuming the same efficiency, would 382 g ethanol provide more, less, or the same quantity of energy as 382 g 2-methylpentane? | Submit Answer Retry Entire Group 8 more group attempts remaining
The Law of Conservation of Energy states, when applied to Calorimetry, states that heat is neither lost nor generated, but merely changes form during processes. Which of these calorimetry equations corresponds to that law?
Reaction Description of Ethanol: In this section, you will describe a reaction related to the production or use of the compound, ethanol. You must include the following: 1)Type of reaction—Describe the general class of reaction (combustion, acid/base, redox, etc.).2)Heat of reaction—Provide the amount of heat that must be added or removed from this reaction at the relevant temperature and whether this reaction is exothermic or endothermic.3)All products, reactants, and catalysts—Include a balanced equation with all states of participants.4)Special considerations—Document the safe operating range of this reaction, safety considerations, and side reactions that may produce unwanted products.5)Summary of other possible reactions—Provide either another reaction to produce the compound or an alternate use and its reaction.
22. Statement A: The system loses 726 J to the surroundings as heat. The enthalpy change for the system is positive. Statement B: The system absorbs 178 J to the surroundings as heat. According to sign conventions heat is negative. Which of the following conclusions is correct about statements A and B? Group of answer choices Statement A is incorrect, Statement B is correct. Both statements are correct. Both statements are incorrect. Statement A is correct, Statement B is incorrect.
Answer correctly in 15 mint plz
CH4 (g) + 2 O2 (g) --> CO2 (g) + 2H2O (g) Δ H = -882 kJ/mol Using the equation above, how many grams of water will form if 655 kJ of energy was released.
1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as the reaction proceeds. Is this reaction endothermic or exothermic? Describe if heat energy is lost or gained from the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? 2. A student performs a reaction and determines the enthalpy change (AH) to be 31.4 kJ. Will the temperature of the surrounding solution increase or decrease as a result of this chemical process? 3. If you hold 3 grams of ice in your hand at room temperature, your hand will become cold. a) Is the reaction H,O(s) – H,O(1) endothermic or exothermic? b) In which direction does heat flow?

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