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Chapter 13: Q4CQ (page 468)

Question: If you add boiling water to a cup at room temperature, what would you expect the final equilibrium temperature of the unit to be? You will need to include the surroundings as part of the system. Consider the zeroth law of thermodynamics.

Short Answer

Expert verified

Answer

The final equilibrium temperature of the unit or the system will be the same as the room temperature. The heat flow of a system is from higher to lower. Here the heat is the transfer from the hot water to the surroundings until it attains the same temperature.

Step by step solution

01

The zeroth law of thermodynamics

The law states that when two objects with different temperatures are in thermal contact with each other. And the heat will flow from the hot object to the cold one until the temperature of both objects will same.

02

Heat transfer to the surroundings

Here you are adding boiling water to a cup that is at room temperature. The surrounding temperature is less than the temperature of the water. So, the heat energy transfer from hot water to the surrounding air, so that they reach thermal equilibrium with each other if you placed it for some time.

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Most popular questions from this chapter

Question:The vapor pressure of water at 40.0ºC is 7.34×103 N/m2. Using the ideal gas law, calculate the density of water vapor in g/m3 that creates a partial pressure equal to this vapor pressure. The result should be the same as the saturation vapor density at that temperature (51.1 g/m3).

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