A 1.25-kg steel pot contains 2.33 L of water. Both pot and water are initially a
ID: 1988499 • Letter: A
Question
A 1.25-kg steel pot contains 2.33 L of water. Both pot and water are initially at 18.9°C. How much heat must flow into the pot and the water to bring their temperature up to 93.1°C? Assume that the effect of water evaporation during the heating process can be neglected and that the temperature remains uniform throughout the pot and the water.Denemeler 0/5
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NEW "Cem Servantie" (cservantie:itu) (Salý, 6. Aralýk 2011, 13:55:06 (EET))
use the following values for the specific heats:
c_water=4.19 kJ/kg.K
c_aluminum=0.900 kJ/kg.K
NEW "Cem Servantie" (cservantie:itu) (Pazar, 11. Aralýk 2011, 14:35:50 (EET))
If you have steel use:
c_v=0.448 KJ/kg.K
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Explanation / Answer
c_water=4.19 kJ/kg.K c_steel=0.448 KJ/kg.K heat required ?Q = K*?T K for steel=(0.448 KJ/kg.K)*(1.25 kg) = .56 KJ/K K for water = (4.19 kJ/kg.K)*(2.33L*1kg/L) = 9.7627 KJ/K K_tot= 10.3227 KJ/K ?T = 93.1-18.9 = 74.2 C +273.15 = 347.35 K ?Q = (347.35 K)*(10.3227 KJ/K) = 3585.5898 KJ
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