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$\bullet$$\bullet$ A flask with a volume of 1.50 $\mathrm{L}$ , provided with a stopcock, contains ethane gas $\left(\mathrm{C}_{2} \mathrm{H}_{6}\right)$ at 300 $\mathrm{K}$ and atmospheric pressure $\left(1.013 \times 10^{5} \mathrm{Pa}\right) .$ The molar mass of ethane is 30.1 $\mathrm{g} / \mathrm{mol}$ . The system is warmed to a temperature of $380 \mathrm{K},$ with the stopcock open to the atmosphere. The stopcock is then closed, and the flask is cooled to its original temperature. (a) What is the final pressure of the ethane in the flask? (b) How many grams of ethane remain in the flask?

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$a ) 80 \times 10^{3} P a$$b ) 1.4477 \times 10^{-3} k g=1.4477 g$

Physics 101 Mechanics

Chapter 15

Thermal Properties of Matter

Temperature and Heat

The First Law of Thermodynamics

The Second Law of Thermodynamics

Simon Fraser University

Hope College

University of Sheffield

University of Winnipeg

Lectures

03:15

In physics, the second law of thermodynamics states that the total entropy of an isolated system can only increase over time. The total entropy of a system can never decrease, and the entropy of a system approaches a constant value as the temperature approaches zero.

03:25

The First Law of Thermodynamics is an expression of the principle of conservation of energy. The law states that the change in the internal energy of a closed system is equal to the amount of heat energy added to the system, minus the work done by the system on its surroundings. The total energy of a system can be subdivided and classified in various ways.

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