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.) The temperature of the water bath is monitored, and it is determined from this data that 319. kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 293. kJ of work on the piston during the reaction. Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? Does the reaction absorb or release energy? How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits. Explanation Check O exothermic O endothermic up Odown Oneither O in out Oneither absorb O release O neither kJ X Ś MacBook Air 1 atm pressure gases piston cylinder water bath C © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessi

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.) The temperature of the water bath is monitored, and it is determined from this data that 319. kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 293. kJ of work on the piston during the reaction. Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? Does the reaction absorb or release energy? How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits. Explanation Check O exothermic O endothermic up Odown Oneither O in out Oneither absorb O release O neither kJ X Ś MacBook Air 1 atm pressure gases piston cylinder water bath C © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessi

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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Every day a certain amount of water evaporates from Earth’s oceans, lakes, and land surface and forms water vapor and clouds in the atmosphere. Every day a certain amount of rain falls back to Earth. Make the reasonable assumption that, on average, the energy absorbed by the evaporation and lifting of the water is equal to the energy released by its condensation and falling back to earth. The evaporation of one mole of water requires approximately 40.6×103 J of heat. An equal amount of heat is released when a mole of water condenses. The annual volume of rainfall on Earth is approximately 4.9×105 km3 and the average cloud altitude is 8.9 km above Earth’s surface. How much energy, in joules, is required every day to evaporate and lift the water?
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Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. However, consider a pipe where water was allowed to sit in the pipe. The hot water cools as it sits in the pipe. What is the temprature change, (AT), of the water if 187.5 g of water sat in the copper pipe from part A, releasing 2298 J of energy to the pipe? The specific heat of water is 4.184 (J/g).°C. Express your answer to four significant figures. • View Available Hint(s) ? AT = °C %3D
A 20.0 g sample of brass, which has a specific heat capacity of 0.375 J.g¹°C¹, is dropped into an insulated container containing 250.0 g of water at 75.0 °C and a constant pressure of 1 atm. The initial temperature of the brass is 9.0 °C. Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has 3 significant digits. °C x10 1 X Ś
DOMINGO Understanding the definitions of heat and work O 0/5 A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them 1 atm pressure piston cylinder water bath gases do 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.) The temperature of the water bath is monitored, and it is determined from this data that 290. kj of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 315. kJ of work on the piston during the reaction. O exothermic Is the reaction exothermic or endothermic? O endothermic O up Does the temperature of the water bath go up or down? O down O neither O in Does the piston move in or out? O out O neither O absorb Does the reaction absorb or release energy? O release O…
Consider the following chemical reaction: C2H6O(l) + O2(g) -----------> CO2(g) + H2O(g) 0.8100 g C2H6O(l) is burned in bomb calorimeter. The initial temperature is 22.000 oC and the temperature rises to 28.200 oC. Calculate the heat of reaction at constant pressure at 22.0 oC in kJ/mole C2H6O The heat capacity of calorimeter is 10.50 kJ/ oC. C= 12.01 g/mole, H = 1.008 g/mole, O = 16.00 g/mole
A 48.0 g sample of glass, which has a specific heat capacity of 0.670 J.g ¹.°C¯¹, is dropped into an insulated container containing 200.0 g of water at 15.0 and a constant pressure of 1 atm. The initial temperature of the glass is 86.5 °C. Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct number of significant digits. 17.63 °C x10 X Be Careful Please check the number of significant digits in your answer. OK
One method of generating electricity is by burning coal to heat water, which produces steam that drives an electric generator. To determine the rate at which coal is to be fed into the burner in this type of plant, the heat of combustion per ton of coal must be determined using a bomb calorimeter. When 1.00 g of coal is burned in a bomb calorimeter (as shown), the temperature increases by 1.48 °C. If the heat capacity of the calorimeter is 21.6 kJ/°C, determine the heat produced by combustion of a ton of coal (2.000 × 103 pounds).
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In a fruit juice plant, pear juice is heated from 30 ° C (feed temperature) to 80 ° C with a heat exchanger to be pasteurized. The heat requirement of the system is met by converting the saturated steam at 117.0 ° C into a saturated liquid at the same temperature. Since pear juice has 20 ° Brix, calculate the amount of steam required for this process (kg steam / kg pear juice).
A 23.0 gram sample of an alloy was heated to 100.00 °C and dropped into a beaker containing 92 grams of water at 25.84 °C. The temperature of the water rose to a final temperature of 27.84 °C. Neglecting heat losses to the room and the heat capacity of the beaker itself, what is the specific heat of the alloy in /g°C? а. 2.16 ОБ. 0.464 O c. 0.232 O d. 4.32
A 102.8 g sample of a metal initially at 183.00C is placed in 35.0 ml of water initially at 25.0 0C. After reaching thermal equilibrium, the final temperature of the system is 58.80C. What is the identity of the metal? Assume no heat is lost to the surroundings.