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2 g of a gas collected over water at 20^...

2 g of a gas collected over water at `20^(@)C` and under a pressure of 770mm Hg occupied 800ml. Calculate the volume of dry gas at S.T.P. condition. Vapour pressure of water at `20^(@)C` is 15mm Hg.

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To solve the problem of finding the volume of dry gas at Standard Temperature and Pressure (STP), we will follow these steps: ### Step 1: Determine the pressure of the dry gas The total pressure of the gas collected over water is given as 770 mm Hg. However, this includes the vapor pressure of water at 20°C, which is 15 mm Hg. Therefore, the pressure of the dry gas (P_dry) can be calculated as follows: \[ P_{dry} = P_{total} - P_{water} \] ...
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