As 390 g of hot chocolate cools in a mug, it transfers 30,000J of heat to...
As 390 g of hot chocolate cools in a mug, it transfers 30,000J of heat to the environment. What is the temperature of the hot chocolate after it has cooled? The specific heat of milk is 3.9 J/goC.
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As 390 g of hot chocolate cools in a mug, it transfers 30,000J
of heat to...
4. (7 + 4 pts) A cup of hot chocolate has temperature 80°C in a room...
4. (7 + 4 pts) A cup of hot chocolate has temperature 80°C in a room kept at 20°C. After half an hour the hot chocolate cools to 60°C. (a) What is the temperature of the chocolate after another half hour? ANSWER: (b) When will the chocolate have cooled to 40°C? ANSWER:
A Styrofoam cup holding 104 g of hot water at 1.00 x 102°C cools to room...
A Styrofoam cup holding 104 g of hot water at 1.00 x 102°C cools to room temperature, 26.0°C. What is the change in entropy of the room? (Neglect the specific heat of the cup and any change in temperature of the room. The specific heat of water is 4,186 J/(kg . °C).) J/K Need Help? Mead
A Styrofoam cup holding 100 g of hot water at 84°C cools to room temperature, 21.0°C....
A Styrofoam cup holding 100 g of hot water at 84°C cools to room temperature, 21.0°C. What is the change in entropy of the room? Neglect the specific heat of the cup and any change in temperature of the room. J/K
When two objects are in thermal contact heat energy is transferred from the hot to the...
When two objects are in thermal contact heat energy is transferred from the hot to the cold object until the temperature of both becomes equal (i.e., the objects are in thermal equilibrium). Suppose you pour 20-gram milk at 200C into a cup of 80-gram tea at 920C. Assume the specific heat of tea is 4.2 J/gram.0K and that of milk is 3.9 J/gram.0K Assuming no heat is lost into the surrounding air what is the temperature of the tea and...
A metal object at 90 oC cools to 25.0 oC by losing 5.56 kJ of heat...
A metal object at 90 oC cools to 25.0 oC by losing 5.56 kJ of heat to the environment. What is the heat capacity, C, of the metal object in units of J/ oC? An object at 40.0 oC is heated to 115.0 oC. How many kJ of heat did it gain from the environment? The heat capacity, C, of the object is 0.690 kJ/ oC. 200.0 g of H 2O at 44.0 oC lost 15.7 kJ of heat to...
How much heat is lost when a solid iron nail weighing 23.00 g cools from 675.0...
How much heat is lost when a solid iron nail weighing 23.00 g cools from 675.0 °C to 133.6 °C? (The specific heat of Fe is 0.450 J/g °C). A 563 J. B 5603 J. C 27670 J. D 2767 J. Question What mass of benzene is cooled from 83.8 °C to 77.1 °C when 167 J of energy is transferred out of the system? (The specific heat of benzene is 1.740 J/g °C). A 1.43 g. B 167 g...
A hot reservoir at the temperature 650 K transfers 2000 J of heat irreversibly to a...
A hot reservoir at the temperature 650 K transfers 2000 J of heat irreversibly to a cold reservoir at temperature 200 K. A) What is the change in entropy of the universe? B) Is entropy a conserved non-conserved quantity?
A hot metal at 125 oC was dropped into 75.0 g of water kept at a...
A hot metal at 125 oC was dropped into 75.0 g of water kept at a room temperature of 20.6 oC in a calorimeter. Within a couple of minutes, water’s temperature increased to 26.8 oC? (a) How much heat energy was absorbed by water? [‘c’ for water is 4.184 J/goC] (b) How much heat energy was released by the metal? (c) What information is needed to calculate the specific heat capacity of the metal?
Copper has a specific heat of .390 j/gc. if 15.1 g of cu is heated to...
Copper has a specific heat of .390 j/gc. if 15.1 g of cu is heated to a tenoerature of 99.0 c and immersed in water. the resulting temperature of the cu was then 35.0. how much heat in j was transferred (added) to the water assume all heat us transferred to the water
100 J of heat was removed from 50 g of an iron bar at 20 oC. What...
100 J of heat was removed from 50 g of an iron bar at 20 oC. What is the final temperature after the iron bar lost the heat? (The specific heat of iron is 0.5 J/goC.)
4. (7 + 4 pts) A cup of hot chocolate has temperature 80°C in a room kept at 20°C. After half an hour the hot chocolate cools to 60°C. (a) What is the temperature of the chocolate after another half hour? ANSWER: (b) When will the chocolate have cooled to 40°C? ANSWER:
A Styrofoam cup holding 104 g of hot water at 1.00 x 102°C cools to room temperature, 26.0°C. What is the change in entropy of the room? (Neglect the specific heat of the cup and any change in temperature of the room. The specific heat of water is 4,186 J/(kg . °C).) J/K Need Help? Mead
A hot reservoir at the temperature 650 K transfers 2000 J of heat irreversibly to a cold reservoir at temperature 200 K. A) What is the change in entropy of the universe? B) Is entropy a conserved non-conserved quantity?
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