a cilearn.csuci.edu The amount of heat that went into raising the tempe 7: Therm

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a cilearn.csuci.edu The amount of heat that went into raising the tempe 7: Thermochemistry 0.5 pts DQuestion 2 If 50 g of hot water at 74.2 °C and 50 g of cold water at 10.4 °C are mixed and the temperature of the mixture reaches a maximum temperature of 32.3 °C, what is AT? 0 -41.9 C 0-219"c 21.9 °C 32.3 °C ? 41.9 °C D Question 3 0.5 pts If 50 g of hot water at 74.2 °C and 50 g of cold water at 10.4 OC are mixed and the temperature of the mixture reaches a maximum temperature of 32.3 °C, what is ar,? 3

Explanation / Answer

Ans. #2. Change in temperature of cold water, dTc =

                        Final temperature at equilibrium – Initial temperature of cold water

                        = 32.30C – 10.40C

                        = 21.90C

So, correct option is- C. 21.90C

Note: The +ve sign of dTc indicates that the temperature of cold water increases while it reaches the thermal equilibrium temperature.

#3. Change in temperature of hot water, dTh =

                        Final temperature at equilibrium – Initial temperature of hot water

                        = 32.30C – 74.20C

                        = -41.90C

So, correct option is- A. -41.90C

Note: The –ve sign of dTh indicates that the temperature of hot water decrease while it reaches the thermal equilibrium temperature.

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