Calculate the heat required to increase the temperature of 630 grams of ice from -2°C to 23°C and turn it to steam with temperature of 124°C. The specific heat of ice is 2. 108 J/(g · °C).
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![Calculate the heat required to increase the temperature of 630 grams of ice from
-2°C to 23°C and turn it to steam with temperature of 124°C. The specific heat of ice
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- 4 kg of ice at 0◦C is converted to steam at100◦C.How much heat is needed? The heat offusion for water is 79500 cal/kg, its heat ofvaporization is 5.4 × 10^5cal/kg, and its specific heat is 1000 cal/kg ·◦ C.Answer in units of kcal.A hot, just-minted copper coin is placed in 103 g of water to cool. The water temperature changes by 8.22°C and the temperature of the coin changes by 88.1°C. What is the mnss of the coin? Disregard any energy transfer to the water's surround- ings and assume the specific heat of copper is 387 J/kg- C. The specific heat of water is 4186 J/kg- C. Answer in units of g- O1. 122871 O 2. 128.638 O 3. 129.928 4. 116.608 5. 112./99 6. 139 655 8. 111.56 110.329 HO103.949x. 62: 1 kg of ice occupies 1.1 × 10 m² al normal pressure. The volume changes to 1.0 x 10 m' when it is melted. Find the internal latent heat of ice. Given : Latent heat of fusion of ice = 80 kcal/kg Density of mercury = 13600 kg/m³, Mechanical equivalent of heat J = 4200 Joules/k cal.
- At a foundry, 22 kg of molten aluminum witha temperature of 660.4◦C is poured into amold.If this is carried out in a room containing150 kg of air at 25◦C, what is the temperatureof the air after the aluminum is completelysolidified? Assume that the specific heat capacity of air is 1.0×10^3J/kg ·◦C. The specificheat of aluminum is 899 J/kg ·◦ C and its latent heat of fusion is 3.97 × 10^5J/kg.Answer in units of ◦CA 50 KW electric furnace measure 1.2m x 1.0m x 0.8m. When the temperature insidethe furnace is 1520 o C, a block of aluminum with a mass of 300kg and a temperatureof 16.5 o C is placed inside. Assuming the heat loss from the furnace walls is 500Watts per m 2 , how long will it take to heat the aluminum block to the furnacetemperature? Assume that the specific heat of aluminum is 0.9 KJ/kg-K.A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. The final temperature of water and iron is 29.5 °C. What is the heat capacity of iron? (Ignore the heat capacity of the container and assume that a negligible amount of water boils away.) Find % error. The specific heat of iron is 448 J/kg °C.
- The energy given off as heat by 310 g of an alloy as it cools through 40C° raises the temperature of 310 g of water from 30°C to 40° C. The specific heat of the alloy (in J/kg · C°) is: (Use c of water = 4186 J/kg C°) A surveyor’s 35-m steel tape is correct at 68° F. On a hot day the tape has expanded to 35.03 m. On that day, the tape indicates a distance of 16.50 m between two points. The true distance between these points is:A 0.1375-g sample of magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 1769 J °C1. The calorimeter contains exactly 300 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning magnesium, in kJ g-l and in kJ mol-!. The specific heat of water is 4.184 J g1 °C -1.Calculate the total heat required to convert 100 g ice at -15°C to steam at 120 "C. (Specific heat of ice = 2090 J/kg °C, Specific heat of water= 4186 J/kg "C, Specific heat of steam = 2.01x10 J/kg C, Latent heat of fusion of ice = 3.33 x 10 J/kg, Latent heat of vaporization of water = 2.26 x 10 J/kg.)
- 18 grams of some unknown material is submerged in 325 grams of water initially at 16.8℃. If the final temperature of the mixture is 21℃, calculate the specific heat of the unknown material assuming the original temperature of the unknown is 245℃. Assume the specific heat of water is 1 cal/g-℃.The heat required to melt a block of ice is 1165500 J. Estimate the total heat required to vaporize the same mass of water that is at 50 °C. ( Cwater = 4186 J/kg.°C, Lf = 3.33 × 105 J/kg, and Lv = 2.26 × 106 J/kg.)Bananas are to be cooled from 24 to 13°C at a rate of 215 kg/h by a refrigeration system. The power input to the refrigerator is 1.4 kW. Determine the rate of cooling, in kJ/min, and the COP of the refrigerator. The specific heat of banana above freezing is 3.35 kJ/kg·°C.
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