Mothballs are composed primarily of the hydrocarbon naphthalene ( C1oHs). When 1.121 g of naphthalene burns in a bomb calorimeter. the temperature rises from 25.143 °C to 32.448 °C. Part A Find A,U for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is 5.112 kJ °C 1 Express your answer using four significant figures. A,U = -4269 kJ mol 1 Submit Previous Answers All attempts used; correct answer displayed Part B Find A,H for the combustion of naphthalene at 298 K. Express your answer using four significant figures. ? A,H = kJ mol1

Mothballs are composed primarily of the hydrocarbon naphthalene ( C1oHs). When 1.121 g of naphthalene burns in a bomb calorimeter. the temperature rises from 25.143 °C to 32.448 °C. Part A Find A,U for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is 5.112 kJ °C 1 Express your answer using four significant figures. A,U = -4269 kJ mol 1 Submit Previous Answers All attempts used; correct answer displayed Part B Find A,H for the combustion of naphthalene at 298 K. Express your answer using four significant figures. ? A,H = kJ mol1

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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A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. In an experiment, a 0.6770 g sample of quinizarin (C14H3O4) is burnmed completely in a bomb calorimeter. The calorimeter is surrounded by 1.304x10° g of water. During the combustion the temperature increases from 25.97 to 28.55 °C. The heat capacity of water is 4.184 J gl°c!. The heat capacity of the calorimeter was determined in a previous experiment to be 893.2 J°C. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of quinizarin based on these data. C1,H3O4(s) + 1402(g)→ 4 H,O(1) + 14 CO2(g) + Energy Molar Heat of Combustion = kJ/mol
Ignition wires heat Thermometer Stirrer A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. sample Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. %3D Water In the laboratory a student burns a 0.596-g sample of acetylsalicylic acid (C,H3O4) in a bomb calorimeter containing 1090. g of water. The temperature increases from 24.40 °C to 26.80 °C. The heat capacity of water is 4.184 J gl°C 1 The molar heat of combustion is -3869 kJ per mole of acetylsalicylic acid. C,H3O4(s) + 9 O2(g) - →9 CO2(g) + 4 H20(1) + Energy Calculate the heat capacity of the calorimeter. Burning sample Insulated Sample dish Steel outside chamber bomb heat capacity of calorimeter = J/°C Combustion (bomb) calorimeter.
Il Metro by T-Mobile 1:06 AM n 24% Question 15 of 35 Submit Specific Heat Capacity J/(g•°C) Metal Aluminum 0.90 Сopper 0.38 Iron 0.45 Magnesium 1.00 Silver 0.23 Tin 0.32 Titanium 0.52 A) Fe B) Sn C) Ag D) Cu Tap here or pull up for additional resources
O THERMOCHEMISTRY Using specific heat capacity to find temperature change A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 7.80 kg of water at 23.4 °C. During the reaction 106. kJ of heat flows out of the bath and into the flask. -1 Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J'g ''K '. Be sure your answer has the correct number of significant digits. ?
10:23 PM Thu May 25 < G car wallpaper ipad - Goog... = THERMOCHEMISTRY G when will stranger things... Understanding the definitions of heat and work AA Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release 331. kJ of energy. Does the gas mixture do work, or is work done on it? Explanation The temperature of the water bath is monitored, and it is determined from this data that 223. kJ of heat flows out of the system during the reaction. How much work is done on (or by) the gas mixture? Round your answer to 3 significant digits. Check…
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Calculate the energy required to heat 557.0 g of ethanol from 8.0 °C to 18.8 °C. Assume the specific heat capacity of ethanol under these conditions is -1 2.44 J-gK 1 Round your answer to 3 significant digits.
O THERMOCHEMISTRY Using specific heat capacity to find temperature change A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 6.90 kg of water at 33.1 °C. During the reaction 131. kJ of heat flows out of the bath and into the flask. -1 Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J-g K sure your answer has the correct number of significant digits. Be
When a reaction was carried out in a bomb calorimeter, 21.37 kJ was released. The initial temperature was 22.157°C. The heat capacity of the system was 17.44 kJ/°C. Calculate the final temperature of the calorimeter. Round of answer to the second decimal place.
dden. out of 10 1 5. Question 1 18 Answer 1: 18 Question 2 Attempt Attempt 3 Attempt 3 Attempt 2 Attempt 1 Be sure to answer all parts. Enter your answer in the provided box. A gas expands and does P-V work on the surroundings equal to 259 J. At the same time, it absorbs 241 J of heat from the surroundings. What is the change in energy of the system? (Answer in Two Significant Figures) J dillard.instructure.com Time (b) against a constant pressure of 4.00 atm. (Answer in 3 Significant Figures) 4 minutes 4 minutes 16 minutes 4 minutes A gas expands from 265 mL to 987 mL at a constant temperature. Calculate the work done (in joules) by the gas if it expands (a) against a vacuum. (Answer in 1 Significant Figure) w = 0 Score 5.5 out of 10 5.5 out of 10 4.5 out of 10. 0 out of 10 CA 0/1 pts 0.5/1 pts
thermometer -1.c A sample of glass, which has a specific heat capacity of 0.670 J'g contains 200.0 g of water. The glass sample starts off at 94.2 °C and the temperature of the water starts off at 16.0 °C. When the temperature of the water stops changing it's 19.3 °C. The pressure remains constant at 1 atm. is put into a calorimeter (see sketch at right) that insulated container water Calculate the mass of the glass sample. Be sure your answer is rounded to the correct number of significant digits. sample a calorimeter Ox10