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N(2) gas is present in a 1 L desiccator ...

`N_(2)` gas is present in a 1 L desiccator at 1 atm pressure. The pressure of the gas decreses to 78 mm Hg pressure when the desiccator is partially evacuated using a vacuum pump at constant temperature. Find out the final volume of the gas.

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Since the volume of the desiccator is fixed, the final volume of the gas will be 1L even after the desiccator is partially evacuated. In this process the number of moles of the gas decreases but its volume and temperature remain the same. As a result pressure of the gas is reduced.
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CHHAYA PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-WARM UP EXERCISE
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