In preparing dinner you need a cup of very hot water, which you prepare on your
ID: 952396 • Letter: I
Question
In preparing dinner you need a cup of very hot water, which you prepare on your electric stove. You use 80.0 kJ of electrical energy to heat 250. g of water starting at 20.0 degree C. What is the final temperature of the water? The specific heat capacity of the water is 4.184 J/(g degree C). A 14.3 g piece of metal was heated to 88.8 degree C and then dropped into a beaker containing 45.0 g of water at 22.00 degree C. When the water and metal come to thermal equilibrium, the temperature is 27.10 degree C. What is the specific heat capacity of the metal? The specific heat capacity of the water is 4.184 J/(g K). 1.00Times 10^2 mL of 1.00 M HCI is mixed with 1.00 Times 10^2 mL of 1.00 M NaOH. They both start the process at 25.0 degree C. The temperature of the calorimeter and the mixture increases 5.98 degree C. The heat capacity of the calorimeter is 1.00 Times 10^2 J/degree C. What is the enthalpy [AH] per mole of HCI used? The specific heat capacity for all of the solutions are 4.184 J/degree C gram and that all densities are 1.00 g/mL.Explanation / Answer
1)
Q = 80 kJ
m = 250 g of water
Ti = 20°C. Tf = ?
Q = m*Cp*(Tf-Ti)
80*10^3 = (250*4.184)(Tf-20)
solve fot Tf
Tf = (80*10^3 )/((250*4.184)) + 20 = 96.48°C
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