12. Which of the following is a TRUE statement about gas? One mole of argon gas

Question

12. Which of the following is a TRUE statement about gas? One mole of argon gas is at one atmosphere of pressure and 25 °C. How can a scientist increase the volume of the fläsk? Circle 2 choices? A Gas particles exert a pressure when they hit the sides of the container B. In general, doubling the pressure of a gas doubles its volume C. Because the molecules have small distances between them compared to their size, they can't be compressed D the volume of gases will decrease if additional moles of gas are added E. Decrease the temperature and increase the pressure F. Hold pressure constant and decrease temperature G. Hold the temperature constant and decrease the pressure H. Hold the temperature constant and decrease moles of gas

Explanation / Answer

gas law equation can be written as PV= nRT

V= nRT/P (1)

so if volume were to be doubled, at constant temperature, reduce the pressure leading to expansion of gas. ( G iscorrect)

alternatively, hold the pressure constant and increase the temperature.

so at constant temperature and pressure, volume can be increased by increaing the no of moles.

the pressure of gas is due to collision of gas molecules with the container(A is correct)

doubling the pressrue compresses the gas. So incorrect. Addition of mole of gas increases the volume at constant temperature and pressure. Decrease the temperature and pressure decreases the volume as per the eq.1.

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