Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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- When a piece of aluminum weighing 52 grams, and at a temperature of 76.3 degrees C , is placed in a calorimeter containing 75.0 grams of water at 21.9 degrees C, the temperature of the water is increases to 28.3 degrees C. What is the specific heat of the calorimeter?arrow_forwardspecific heat of gold is 0.129J/g C. what is molar heat capacity of gold?arrow_forwardq represents the change in heat of a reaction or substance. The units of q are Joules (J) or kilojoules (kJ). For a well understood substance, we can calculate the specific heat which relates the mass of the substance in grams to the amount of heat in J required to raise that amount a certain temperature. We call that specific heat. The specific heat (Cs) of water is stated in the following way: C s ( H 2 O ) = 4.186 J g ∘ C This means that it takes 4.186 J of energy to raise the temperature of 1g of water by 1ºC. The relationship between q and Cs for a given substance is where m is mass (g) and ∆T is the change in temperature in ºC (final temp - initial temp). Calculate the heat change (q) in J when 4.297 grams of water is cooled from 3.967 ºC to -2.902 ºC. Enter your answer with one decimal place (tenths). Pay careful attention to the sign of your answer. The sign of ∆T is always the same as the sign for q.arrow_forward
- A piece of solid substance weights 4.0 g, and requires 150 J to increase its temperature from 30.0 degrees Celsius to 40.0 degrees Celsius. What is the specific heat capacity of the substance?arrow_forwardAn 80.0g sample of metal, initially at 96 degrees C, is placed into 150g of water initially at 26 degrees C in a calorimeter. The final temperature of the water is 28.1 degrees C. What is the specific heat of the metal?arrow_forwardWhen 6.54 grams of Zn is placed in 500.0 mL of 1.00 M CuSO4(aq) in a coffee cup calorimeter, it reacts completely to displace copper. The temperature of the solution rises from 20.0˚C to 30.4˚C. Assume the coffee cup itself gains no heat and that the solution has the same density (1.00 g/mL) and specific heat (4.184 J/g˚C) as pure water. (a) How much heat does the solution gain during this reaction? (in J)arrow_forward
- 3. A 74.5 g piece of metal at 86.0°C is placed in 133 g of water at 21.0°C contained in a calorimeter. The metal and water come to the same temperature at 24.2°C. How much heat (in J) did the metal give up to the water? (Assume the specific heat of water is 4.18 J/g·°C across the temperature range.) J What is the specific heat (in J/g·°C) of the metal? J/g·°C 4. A 0.528 g sample of KCl is added to 51.7 g of water in a calorimeter. If the temperature decreases by 1.07°C, what is the approximate amount of heat (in J) involved in the dissolution of the KCl, assuming the heat capacity of the resulting solution is 4.18 J/g°C? J Is the reaction exothermic or endothermic? exothermicendothermic 5. When 2.56 g of methane burns in oxygen, 128 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of methane under these conditions? kJ/mol methane 6. Joseph Priestly prepared oxygen in 1774 by heating red mercury(II) oxide with sunlight focused through a lens. How much…arrow_forwardWhat is the specific heat of a 45.51 g piece of an unknown metal that exhibits a 45.2 °C temperature change upon absorbing 1870 J of heat?arrow_forwardHow much heat (in kJ) is evolved (under standard conditions) when 97.55 g of copper reacts to form copper (II) oxide?arrow_forward
- The temperature of a sample of water increases from 20C to 46.6C as it absorbs 5650J of heat. What is the mass of the sample?arrow_forwardWhen a sample of titanium was supplied 1.00 kJ of energy, the temperature rose 103.5 °C. If the specific heat of titanium is 0.523 J/g · °C, what is the mass of the titanium sample?arrow_forwardA metal object with mass of 21.4 g is heated to 97.0 °C and then transferred to an insulated container containing 81.7 g of water at 20.5°C. The water temperature rises and the temperature of the metal object falls until they both reach the same final temperature of 23.1 °C. What is the specific heat of this metal object? Assume that all the heat lost by the metal object is absorbed by the water. cal specific heat:arrow_forward
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