ou want to cool a .25 kg glass of water from 20C to 0C by adding ice initially at -20C. What mass of ice should be added to make the final temperature of the water be 0C with all of the ice melted? ch2o=4190J/kgC; cice=2000J/kgC; Lf=3.4x10^5J/kg
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You want to cool a .25 kg glass of water from 20C to 0C by adding ice initially at -20C. What mass of ice should be added to make the final temperature of the water be 0C with all of the ice melted? ch2o=4190J/kgC; cice=2000J/kgC; Lf=3.4x10^5J/kg
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- How long does it take to raise the temperature of a 0.750-kg aluminum pot containing 2.50 kg of water from 30.0°C to the boiling point and then boil away 0.750 kg of water if the rate of heat transfer is 500 W, 1 watt = 1 joule/second? Select the correct answer 7.91 × 103 Your SAnswer О 1.01 х 104s O 2.31 × 104s О 5.20 х 103 s О 4.94 х 103 SOne liter of a certain gas is heated from 25 degrees C to 1000C. What is the final volume?β= 950 x10-6/°CA bolt hole in a brass plate has a diameter of1.21 cm at 19.62°C. What is the diameter of the hole when the plate is heated to193.44°C? (The coefficient of linear thermal expansion for brass is 19 × 10-6 /C°.) a. 0.0052581 b. 1.2140 c. 1.2103 d. 0.0069607
- How many grams of coffee must evaporate from 700 g of coffee in a 190 g glass cup to cool the coffee and the cup from 95.0°C to 24.0°C? Assume the coffee has the same thermal properties as water and that the average heat of vaporization is 2,340 kJ/kg (560 cal/g). Neglect heat losses through processes other than evaporation, as well as the change in mass of the coffee as it cools. g Do the latter two assumptions cause your answer to be higher or lower than the true answer? O My answer is lower than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need more evaporation for the same temperature drop. O My answer is higher than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need less evaporation for the same temperature drop. O My answer is higher than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need more evaporation for the same temperature drop. O My…An aluminum rod is heated to 245 ºC and placed in a coffee cup calorimeter containing 250.0 g of water at 22.0 ºC. After the system has reached thermal equilibrium, the temperature of the water is found to be 49.0 ºC. What was the mass of the rod? Assume no heat is lost to the calorimeter.Cs(Al) = 0.921 J g-1 ºC-1Cs(H2O) = 4.18 J g-1 ºC-1A mFe = 0.16 kg mass of iron is heated to 100∘C and then placed in a Styrofoam cup containing mw = 0.50 kg of water. Initially, the water and has a temperature of 27∘C. Find the equilibrium temperature of the system. cw = 4186 J/kg∘C and cFe = 460 J/kg∘C.
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