5 In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of aor to measure the energy of a solution phase reaction.A student heats 69.11 grams of zinc to 98.40 °C and then drops it into a cup containing 82.88 grams of water at 23.55 °C. She measfinal temperature to be 28.74 °C.The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment toJ°C.Assuming that no heat is lost to the surroundings calculate the specific heat of zinc.Specific Heat (Zn) =[In the laboratory a "ceffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid,or to meanure the mergy of a solution phase reactionA student heats 69.11 grams of zine to 98.40 "C and then drops it mto a cup containing 82.88 grams of water at 23.55 C. She measures thefinal temperature to be 28.74 CThe heat capacity of the calorimeter (sometumes referred to as the calorimeter contan) was determined in a separate experiment to be 1.79Assuming that no heat is lost to the surroundings calculate the specific heat of zineSpecifle Heat (Zn)=

Mass of Zn = MZn= 69.1 gInitial temperature of Zn = Tzn = 98.40°CMass of water = M = 82.88 gInitial…

In the laboratory a "cefee cup calerimer, or constant pressure calorimeter, in frequently und to determine the specific heat of a sold or to meanre the mergy of a solution phase reaction A sadest heats 9.11 grams of sinc to 98.40 C and then drops it to a cup containing 82.85 grams of water at 23.s5C She meases the final temperature to be 28.74 C. The heat capacity of the calorimeter (sometumes refemed to as the calormeter contan was determined in a separate experiment to be 19 Assmng that so heat lost to the suroundings calculate the specific heat of zine Sperife Heat Znj-

In the laboratory a "cefee cup calerimer, or constant pressure calorimeter, in frequently und to determine the specific heat of a sold or to meanre the mergy of a solution phase reaction A sadest heats 9.11 grams of sinc to 98.40 C and then drops it to a cup containing 82.85 grams of water at 23.s5C She meases the final temperature to be 28.74 C. The heat capacity of the calorimeter (sometumes refemed to as the calormeter contan was determined in a separate experiment to be 19 Assmng that so heat lost to the suroundings calculate the specific heat of zine Sperife Heat Znj-

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

Chapter6: Thermochemistry

Section: Chapter Questions

Problem 112AE: In a bomb calorimeter, the reaction vessel is surrounded by water that must be added for each...

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Salicylic acid, C7H6O3, is one of the starting materials in the manufacture of aspirin. When 1.00 g of salicylic acid burns in a bomb calorimeter, the temperature of the bomb and water goes from 23.11C to 28.91C. The calorimeter and water absorb 21.9 kJ of heat. How much heat is given off when one mole of salicylic acid burns?
9.32 The material typically used to heat metal radiators is water. If a boiler generates water at 79.5°C, what mass of water was needed to provide the heat required in the previous problem? Water has a specific heat of 4.184Jg1 C1 .
A sample of nickel is heated to 99.8C and placed in a coffee-cup calorimeter containing 150.0 g water at 23.5C. After the metal cools, the final temperature of metal and water mixture is 25.0C. If the specific heat capacity of nickel is 0.444 J/C g, what mass of nickel was originally heated? Assume no heat loss to the surroundings.
How much heat is absorbed by a 44.7-g piece of leadwhen its temperature increases by 65.4°C?
In a calorimetric experiment, 6.48 g of lithium hydroxide, LiOH, was dissolved in water. The temperature of the calorimeter rose from 25.00C to 36.66C. What is H for the solution process? LiOH(s)Li(aq)+OH(aq) The heat capacity of the calorimeter and its contents is 547 J/C.
A 50-mL solution of a dilute AgNO3 solution is added to 100 mL of a base solution in a coffee-cup calorimeter. As Ag2O(s) precipitates, the temperature of the solution increases from 23.78 C to 25.19 C. Assuming that the mixture has the same specific heat as water and a mass of 150 g, calculate the heat q. Is the precipitation reaction exothermic or endothermic?
In a bomb calorimeter, the reaction vessel is surrounded by water that must be added for each experiment. Since the amount of water is not constant from experiment to experiment, the mass of water must be measured in each case. The heat capacity of the calorimeter is broken down into two parts: the water and the calorimeter components. If a calorimeter contains 1.00 kg water and has a total heat capacity of 10.84 kJ/C, what is the heat capacity of the calorimeter components?
When calcium carbonate, CaCO3 (the major constituent of limestone and seashells), is heated, it decomposes to calcium oxide (quicklime). CaCO3(s)CaO(s)+CO2(g);H=177.9kJ How much heat is required to decompose 21.3 g of calcium carbonate?
9.104 An engineer is using sodium metal as a cooling agent in a design because it has useful thermal properties. Looting up the heat capacity, the engineer finds a value of 28.2 J mol-l °C-l. Carelessly, he wrote this number down without units. As a result, it was later taken as specific heat. (a) What would he the difference between these two values? (b) Would the engineer overestimate the ability of sodium to remove heat from the system or underestimate it because of this error? Be sure to explain your reasoning.
The temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it passes through the radiator it has a temperature of 175 F. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g oC.
Assume 200. mL of 0.400 M HCl is mixed with 200. mL of 0.400 M NaOH in a coffee-cup calorimeter The temperature of the solutions before mixing was 25.10 C; after mixing and allowing the reaction to occur, the temperature is 27.78 C. What is the enthalpy change when one mole of acid is neutralized? (Assume that the densities of all solutions are 1.00 g/mL and their specific heat capacities are 4.20 J/g K.)
9.31 A metal radiator is made from 26.0 kg of iron. The specific heat of iron is 0.449Jg1C1 . How much heat must be supplied to the radiator to raise its temperature from 25.0 to 5 5.0°C?

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