A piece of aluminum (which has a specific capacity of 0.891 J/"C-g} is heated to 82.4°C and dropped into a calorimeter containing 76 of water (specific heat capacity of water is 4.18 J/g C) initially at 22.3°C. When the temperature stabilized, the temperature of the mixture was 25.8°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added? 22.1g 2.05g 2.30g 1.11x 103g 38 g

A piece of aluminum (which has a specific capacity of 0.891 J/"C-g} is heated to 82.4°C and dropped into a calorimeter containing 76 of water (specific heat capacity of water is 4.18 J/g C) initially at 22.3°C. When the temperature stabilized, the temperature of the mixture was 25.8°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added? 22.1g 2.05g 2.30g 1.11x 103g 38 g

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 64E: A 110.-g sample of copper (specific heat capacity = 0.20 J/C g) is heated to 82.4C and then placed...

See similar textbooks

Similar questions

When ice at 0C melts to liquid water at 0C, it absorbs 0.334 kJ of heat per gram. Suppose the heat needed to melt 38.0 g of ice is absorbed from the water contained in a glass. If this water has a mass of 0.210 kg and a temperature of 21.0C, what is the final temperature of the water? (Note that you will also have 38.0 g of water at 0C from the ice.)
Ethyl alcohol, C2H5OH, is the intoxicating agent in liquor. Burning 1.00 g of ethyl alcohol in an excess of oxygen at 23.28C and constant volume releases 29.52 kJ of heat. When 7.40 g of ethyl alcohol is burned in oxygen under the same conditions in a bomb calorimeter, the temperature of the bomb and water rises from 23.28C to 48.04C. The bomb holds 0.750 kg of water. (a) What is q for the combustion of the ethyl alcohol in the bomb calorimeter? (b) What is qH2O? (c) What is qcal? (d) What is the heat capacity of the calorimeter?
A 45-g aluminum spoon (specific heat 0.88 J/g C) at 24 C is placed in 180 mL (180 g) of coffee at 85 C and the temperature of the two become equal. (a) What is the final temperature when the two become equal? Assume that coffee has the same specific heat as water. (b) The first time a student solved this problem she got an answer of 88 C. Explain why this is clearly an incorrect answer.
Draw an energy-level diagram (e.g., see Figure 5.6) based on each of the following thermochemical equations. Label each level with the amounts of substances present, and use an arrow between levels for the given enthalpy change. (Do not show the reverse process on the diagram.) (a) C(s,graphite)+H2O(g)CO(g)+H2(g)H=+131.3kJ (b) CO(g)+H2O(g)CO2(g)+H2(g)H=41.2kJ (c) 2SO2(g)+O22SO3(g)H=197.8kJ
A 5.0-g sample of water starting at 60.0C loses 418 J of energy in the form of heat. What is the final temperature of the water after this heat loss? a 20.C b 40.C c 50.C d 60.C e 80.C
Hydrogen is burned in oxygen to release heat (see equation below). How many grams of hydrogen gas must be burned to release enough heat to warm a 50.0-g block of iron from 21C to 225C? 2H2(g)+O2(g)2H2O(g);H=484kJ Iron has a specific heat of 0.449 J/(gC).
A 70.0-g piece of metal at 80.0 °C is placed in loo g of water at 22.0 °C contained in a calorimeter like that shown in Figure 5.12. The metal and water come to the same temperature at 24.6 °C. How much heat did the metal give up to the water? What is the specific heat of the metal?
Isooctane is a primary component of gasoline and gives gasoline its octane rating. Burning 1.00 mL of isooctane (d=0.688g/mL) releases 33.0 kJ of heat. When 10.00 mL of isooctane are burned in a bomb calorimeter, the temperature in the bomb and water rises from 23.2C to 66.5C. The bomb contains 1.00 kg of water. What is the heat capacity of the calorimeter?
A 15.5-g piece of chromium, heated to 100.0 C, is dropped into 55.5 g of water at 16.5 C. The final temperature of the metal and the water is 18.9 C. What is the specific heat capacity of chromium? (Assume no energy is lost to the container or to the surrounding air.)
A 110.-g sample of copper (specific heat capacity = 0.20 J/C g) is heated to 82.4C and then placed in a container of water at 22.3C. The final temperature of the water and copper is 24.9C. What is the mass of the water in the container, assuming that all the heat lost by the copper is gained by the water?
General Zod has sold Lex Luthor what Zod claims to be a new copper-colored form of kryptonite, the only substance that can harm Superman. Lex, not believing in honor among thieves, decided to carry out some tests on the supposed kryptonite. From previous tests, Lex knew that kryptonite is a metal having a specific heat capacity of 0.082 J/gC and a density of 9.2 g/cm3. Lex Luthers first experiment was an attempt to find the specific heat capacity of kryptonite. He dropped a 10 g 3 g sample of the metal into a boiling water bath at a temperature of 100.0C 0.2C. He waited until the metal had reached the bath temperature and then quickly transferred it to I 00 g 3 g of water that was contained in a calorimeter at an initial temperature of 25.0C 0.2C. The final temperature of the metal and water was 25.2C. Based on these results, is it possible to distinguish between copper and kryptonite? Explain. When Lex found that his results from the first experiment were inconclusive, he decided to determine the density of the sample. He managed to steal a better balance and determined the mass of another portion of the purported kryptonite to be 4 g 1 g. He dropped this sample into water contained in a 25-mL graduated cylinder and found that it displaced a volume of 0.42 mL 0.02 mL. Is the metal copper or kryptonite? Explain. Lex was finally forced to determine the crystal structure of the metal General Zod had given him. He found that the cubic unit cell contained four atoms and had an edge length of 600. pm. Explain how this information enabled Lex to identify the metal as copper or kryptonite. Will Lex be going after Superman with the kryptonite or seeking revenge on General Zod? What improvements could he have made in his experimental techniques to avoid performing the crystal structure determination?
A system releases 125 kJ of heat while 104 kJ of work is done on it. Calculate E.