Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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If you have a digital balance, a calorimeter, pure water, and a small metal bar, and two thermometers, describe how you would measure the specific heat of the metal. In your description you should include the relevant heat flow equations.
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- A 50.5-g metal weight, heated to 85.50°C, is placed into 171 g of water at 20.05°C contained in a perfectly insulating thermos flask. After some time, the temperature inside the thermos flask stabilizes at 24.10°C.The specific heat capacity of water is approximately 4.18 J/K/g in the temperature range 16°C - 61°C.Calculate the specific heat capacity of the metal.arrow_forwardA 46.9-g iron rod, initially at 18.6 oC is submerged into 50.4 g of water at an unknown initial temperature. The final temperature of the mixture upon reaching thermal equilibrium is 69.6 oC. What is the initial temperature of the water (in oC)? The specific heat capacity of iron is 0.449 J/g.oC The specific heat capacity of water is 4.184 J/g.oCarrow_forwardAn equilibrium constant for the reaction decreases twice when temperature increases from 300 K to 350 K. What is the standard enthalpy for the reaction? Round off your answer to 3 significant figures and enter it correct units.arrow_forward
- A 21.42g sample of an unknown metal was heated to 99.5ºC, and the added to 50.00g of water contained in a foam coffee cup. The initial temperature of the water was 20.5ºC, and the final temperature of the metal and water was 25.1ºC. The calorimeter constant for the coffee-cup calorimeter was 13.5 J/ºC. What was the specific heat of the metal? * the answer is 0.64 J/gºC, but I need to know how to get therearrow_forwardTypically, 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 %3Darrow_forwardIn the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction.A chunk of lead weighing 19.61 grams and originally at 97.01 °C is dropped into an insulated cup containing 82.14 grams of water at 21.79 °C.The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.61 J/°C.Using the accepted value for the specific heat of lead (See the References tool), calculate the final temperature of the water. Assume that no heat is lost to the surroundings.arrow_forward
- A 53.0-g metal weight, heated to 89.50°C, is placed into 133 g of water at 20.65°C contained in a perfectly insulating thermos flask. After some time, the temperature inside the thermos flask stabilizes at 23.10°C. The specific heat capacity of water is approximately 4.18 J/K/g in the temperature range 16°C - 61°C.Calculate the specific heat capacity of the metal.arrow_forwardA 45.90 g sample of pure copper is heated in a test tube to 99.40°C. The copper sample is then transferred to a calorimeter containing 61.04 g of deionized water. The water temperature in the calorimeter rises from 24.39°C to 29.10°C. The specific heat capacity of copper metal and water are J and 4.184 J 0.387 respectively. g. °C g. °C Assuming that heat was transferred from the copper to the water and the calorimeter, determine the heat capacity of the calorimeter. Heat capacity of calorimeter-arrow_forwardA heat engine is used to convert heat into work. If it draws heat from a bath at 500 K, converts it to work, then delivers the remaining heat into a bath at 200 K, what is its maximum possible efficiency?arrow_forward
- Nonearrow_forwardThe standard heat of formation, AH;, is defined as the enthalpy change for the formation of one mole of Part B substance from its constituent elements in their standard states. Thus, elements in their standard states have AH: = 0. Heat of formation values can be used The combustion of ethene, C2H4, occurs via the reaction to calculate the enthalpy change of any reaction. C2H4 (g) + 302 (g)→2CO2(g) + 2H20(g) Consider, for example, the reaction with heat of formation values given by the following table: 2NΟ (5) + Ο, (s) 2ΝO, (g) ΔΗρ (kJ/mol) Substance with heat of formation values given by the following table: C2H4 (g) 52.47 CO2 (g) -393.5 Substance (kJ/mol) H2O(g) -241.8 NO(g) 90.2 Calculate the enthalpy for the combustion of ethene. 02 (g) Express your answer to four significant figures and include the appropriate units. NO2(g) 33.2 • View Available Hint(s) Then the heat of formation for the overall reaction is ΔΗ ΔΗ (products) -ΔΗ; (reactants ) [2(90.2) + 0] HA ? 2(33.2) -114 kJ/mol…arrow_forward
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