A 39 g aluminum spoon (specific heat 0.904 J/g-°C) at 25°C is placed in 178 mL (177 g) of coffee at 84°C and the temperature of the two become equal. (a) What is the final temperature (in °C) when the two become equal? (Assume that coffee has the same specific heat as water, 4.1801 J/g.°C.) 4.0 °C (b) The first time a student solved this problem she got an answer of 87°C. Explain why this is clearly an incorrect answer. O The temperature of the spoon should decrease when it is exposed to the coffee. O Coffee is always lukewarm by the time you get around to drink it, and so is the spoon. O The temperature of the coffee cannot increase when a colder spoon is placed in it. O The student forgot to convert the temperature to kelvins when working this problem. Supporting Materials Periodic Table Constants and Supplemental Data Factors Additional Materials ASection 5 2 Show My Work (Required) 3 Uploaded File (10 le m What steps or reasoning did you use? Your work counts towards your score. You can submit show my work an unlimited number of times. E 2 Type here to search 80

A 39 g aluminum spoon (specific heat 0.904 J/g-°C) at 25°C is placed in 178 mL (177 g) of coffee at 84°C and the temperature of the two become equal. (a) What is the final temperature (in °C) when the two become equal? (Assume that coffee has the same specific heat as water, 4.1801 J/g.°C.) 4.0 °C (b) The first time a student solved this problem she got an answer of 87°C. Explain why this is clearly an incorrect answer. O The temperature of the spoon should decrease when it is exposed to the coffee. O Coffee is always lukewarm by the time you get around to drink it, and so is the spoon. O The temperature of the coffee cannot increase when a colder spoon is placed in it. O The student forgot to convert the temperature to kelvins when working this problem. Supporting Materials Periodic Table Constants and Supplemental Data Factors Additional Materials ASection 5 2 Show My Work (Required) 3 Uploaded File (10 le m What steps or reasoning did you use? Your work counts towards your score. You can submit show my work an unlimited number of times. E 2 Type here to search 80

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 a calorimeter, a 75.0 g piece of metal at 98.6 *C is submerged in 100.0 g of water, that is initially at 21.8 *C. When the metal and water reach thermal equilibrium, the temperature is 26.2 *C. What was the heat capacity of the metal (3 sig figs)?
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A certain reaction has Ho = -43.40 kJ and So = 23.20 J/K.(a) Is this reaction exothermic, endothermic or isothermic (neither)?This reaction is________ .(b) Does this reaction lead to a decrease, an increase, or no change in the degree of disorder in the system?This reaction leads to_______ in the disorder of the system.
How many grams of an unknown substance, having a specific heat of 1.66 J g ° C, are present if a temperature change of -173.4 K occurs. The heat lost was 35981 J.
A silver kettle weighs 1.02 kg. (The specific heat of silver is 0.235 J/g·°C) (a) What is the heat capacity (in J/°C) of the kettle? _______________ J/°C (b) How much heat (in J) is required to increase the temperature of this kettle from 22.3°C to 99.5°C? _________________ J (c) How much heat (in J) is required to heat this kettle from 22.3°C to 99.5°C if it contains 1.10 L of water (density of 0.997 g/mL and a specific heat of 4.18 J/g·°C across the temperature range)? ______________________J
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