Note: iron mass = 25 g
water mass = 25 mL
C iron = 0.449 J / g · ° C
C water = 4.18 J / g · ° C
ΔT iron = 398 K
ΔT water = 298 K
Water density = 1000 g / mL
Asked: T?
Answer: Using the formula:
=> m, iron x C, iron x Δ T = - m, water x C, water x Δ T
=> 25 g) (0.449 J / g · ° C) (T - 398 K) = - (25 mL) (1000 g / mL) (4.18 J / g · ° C) (T - 298 K)
=> T = 298K
So, the final temperature of water is 298 K
<h2>Further Explanation
</h2>
The Black Principle is a principle in thermodynamics put forward by Joseph Black. This principle sets out:
- If two different objects whose temperature is mixed, a hot object gives heat to a cold object so that the final temperature is the same
- The amount of heat absorbed by cold objects is equal to the amount of heat released by hot objects
- The refrigerated object releases the same heat as the heat absorbed when heated
The sound of the Black Principle is as follows:
"In mixing two substances, the quantity of heat released by a substance whose temperature is higher is that the identical due to the quantity of heat received by a substance whose temperature is lower"
Thermodynamics is the physics of energy, heat, work, entropy and the spontaneous process. Thermodynamics is closely related to statistical mechanics where the thermodynamic relationship originates. In systems where the process of change of form or energy exchange occurs, classical thermodynamics is not related to the kinetics of the reaction (the speed of a reaction process takes place). Therefore, the use of the term "thermodynamics" usually refers to equilibrium thermodynamics, which is the main concept of a quasi-static process, which is idealized. Meanwhile, time-dependent thermodynamics is non-equilibrium thermodynamics. Because thermodynamics is not related to the concept of time, it has been proposed that equilibrium thermodynamics should be called thermostatic. The law of thermodynamics is very general truth, and these laws do not depend on the details of the interactions or systems under study. This means they can be applied to systems where one knows nothing except the balance of the transfer of energy and existence between them and the environment. Examples include Einstein's estimates of spontaneous emission in the 20th century and current research on the thermodynamics of black bodies.
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Details
Grade: College
Subject: Chemistry
keywords: The Black Principle
