4Gılll Gilll00:21* 67%f [Template] Mo... /Answer the following problems:1. Two solid objects, A and B, are placed in boiling water and allowed to come tothe temperature of the water. Each is then lifted out and placed in separatebeakers containing 1000 g of water at 10.0 °C. Object A increases the watertemperature by 3.50 °C; B increases the water temperature by 2.60 C.a. Which object has the larger heat capacity?b. What can you say about the specific heats of A and B?2. The specific heat of octane, CsHss0), is 2.22 Jig-K.a. How many J of heat are needed to raise the temperature of 80.0 g ofoctane from 10.0 to 25.0 °C?b. Which will require more heat, increasing the temperature of 1 mol ofCH18, by a certain amount or increasing the temperature of 1 mol ofHOm by the same amount?3. Calculate the enthalpy change for the reactionP.0a (4) + 2 02 (0) - P,010(5)given the following enthalpies of reaction:AH = -1640.1 k)Pa (s) + 302 (9) - P,0.4)Pa (s) + 5 02 (9) - P,010 (9)AH = -2940.1 k)4. From the enthalpies of reactionH2 (9) + F2 (0) - 2 HF)C9 +2 F2 (0) - CF. (6)2 C) +2 H2 (0) - CHa (0)AH = -537 k)AH = -680 k/AH = +52.3 k)calculate AH for the reaction of ethylene with F2:12THERMOCHEMISTRY...CH4 (9) + 6 F2 (9) + 2 CF, () + 4 HF)5. Gasoline is composed primarily of hydrocarbons, including many with eightcarbon atoms, called octanes. One of the deanest-buming octanes is acompound called 2,3,4- trimethylpentane, which has the following structuralformula:сн, сн, сн,H;C-CH-CH-CH-CH,The complete combustion of one mole of this compound to COzig and H2Ogleads to AH° = -5064.9 k).a. Write a balanced equation for the combustion of 1 mol of CaH18n.b. By using the information in this problem and data in the thermodynamicproperties table, calculate AH for 2,3,4-trimethylpentane.6. The following is known as the thermite reaction:2 Alg + Fe,0s(4) - Al,03(9) + 2 Feg)This highly exothermic reaction is used for welding massive units, such as propellers forlarge ships. Using standard enthalpies of formation, calculate AH° for this reaction.I hope you'll enjoy the taskAnswer Key

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1. Two solid objects, A and B, are placed in boiling water and allowed to come to the temperature of the water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0 °C. Object A increases the water temperature by 3.50 °C: B increases the water temperature by 2.60 "C. a. Which object has the larger heat capacity? b. What can you say about the specific heats of A and B?

1. Two solid objects, A and B, are placed in boiling water and allowed to come to the temperature of the water. Each is then lifted out and placed in separate beakers containing 1000 g of water at 10.0 °C. Object A increases the water temperature by 3.50 °C: B increases the water temperature by 2.60 "C. a. Which object has the larger heat capacity? b. What can you say about the specific heats of A and B?

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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1. Consider the following data: Metal AI Cu Mass (g) Specific heat (J/g °C) 0.9 Temperature (°C) 10 30 0.385 40 60 When these two metals are placed in contact, which of the following will take place? A. Heat will flow from Al to Cu because Al has a larger specific heat. B. Heat will flow from Cu to Al because Cu has a larger mass. C. Heat will flow from Cu to Al because Cu has a larger heat capacity. D. Heat will flow from Cu to Al because Cu is at a higher temperature. E. No heat will flow in either direction
4 A chemical reaction is run in 450 grams of liquid water, resulting in the water increasing from a temperature of 15 °C to 95 °C. a. Use the equations in your textbook to calculate how much heat is absorbed by the water? b. What is the change in enthalpy for the system? c. What is the change in enthalpy for the surroundings?
Material A and material B was exposed to the same change in temperature- but the heat involved with A is 3 times greater than B. If mass of A is 1 kg and mass of B is 10 kg. how do you describe their specific heat ? * O Specific heat of A is 10 times lesser compared to B O Specific heat of A is 10 times greater compared to B O Specific heat of A is 20 times greater compared to B Specific heat of A is 30 times greater compared to B
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4. The heat capacity of copper is 0.382 J/g°.C. A 22.6 g sample of copper at 93° C is placed in 50 g of water at 23.9° C. What is the final temperature of the system?
A sample of 175°C copper is placed into a beaker with 100 grams of 25°C water. Which sample of copper will heat the water to the lowest final temperature? The specific heat of copper is 0.385 J-g-1.°C-1. The specific heat of water is 4.184 J·g-1.°C-1. A. 5.0 g Cu B. 2.0 g Cu C. 0.5 g Cu D. 1.0 g Cu
6. A metal bar with a specific heat of 0.611J/g Cthat has been heated to100.0 "C is placed into a calorimetes containing 25.0g of water at a temperature of 23.0 °C. The final temperature of the system is 32.7 "C. What is the mass of the metal?
1. Melted methane was ignited and used to heat water in a thin metal container. After a short period of time, the methane was extinguished and final measurements were made. = 7.52 g = 7.20 g Mass of methane before burning Mass of methane after burning Mass of water in container Initial temperature of water Final temperature of water = 140.0 g = 10.0°C = 32.0°C a) Using this data, calculate the heat of combustion of methane in kJ/mol. Assume that all the heat from the methane was absorbed by the water b) Write the thermochemical equation for the complete combustion of methane.