1- A piece of glass has a temperature of 71.1 piece of glass has a temperature o
ID: 2246103 • Letter: 1
Question
1- A piece of glass has a temperature of 71.1
piece of glass has a temperature of 71.1degree C. Liquid that has a temperature of 43.0 degree C is poured over the glass, completely covering it, and the temperature at equilibrium is 51.5 degree C. The mass of the glass and the liquid is the same. Ignoring the container that holds the glass and liquid and assuming that the heat lost to or gained from the surroundings is negligible, determine the specific heat capacity of the liquid. (See Table 12.2 for appropriate constants.) The latent heat of vaporization of H2O at body temperature (37.0 degree C) is 2.42 106 J/kg. To cool the body of a 89 kg jogger (average specific heat capacity = 3500 J/(kg· C degree)) by 1.8 degree C, how many kilograms of water in the form of sweat have to be evaporated?Explanation / Answer
1) Cg*(71.1-51.5) = Cl*(51.1-43)
Cl = 2032.59
2) 85*3500*1.8 = m*((4186*(100-37)) + (2.42*10^6))
m = 0.1995 kg = 199.5 g
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