STAPLES Questions: nRT 1. In certain cases, the ideal gas law (P--)can fail to a
ID: 543062 • Letter: S
Question
STAPLES Questions: nRT 1. In certain cases, the ideal gas law (P--)can fail to accurately predict the pressure of a gas given the temperature and number of moles of gas are known, and the volume of the container is known. Identify the conditions that are likely to lead to failure of the ideal gas law: a. High number density temperature, strong (attractive) intermolecular b. Low number density)morate temperature, weak intermolecular forces forces For the choice you made above, explain why you think the ideal gas law will fail. Further explain in which way it will fail; that is, will the predicted pressure be too high or too low compared to actual pressure? 2.
Explanation / Answer
1)
The causes of deviations from ideal behaviour may be due to the following two assumptions of kinetic theory of gases.
The volume occupied by gas molecules is negligibly small as compared to the volume occupied by the gas.
The forces of attraction between gas molecules are negligible.
The first assumption is valid only at low pressures and high temperature, when the volume occupied by the gas molecules is negligible as compared to the total volume of the gas. But at low temperature or at high pressure, the molecules being in compressible the volumes of molecules are no more negligible as compared to the total volume of the gas.
The second assumption is not valid when the pressure is high and temperature is low. But at high pressure or low temperature when the total volume of gas is small, the forces of attraction become appreciable and cannot be ignored.
In knowledge of above facts answer will be (a)
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