A certain quantity of gas occupies a volume of 0.1 L when collected over water at apressureof 0.9atm . The same gas occupied a volume of 0.080L at STPin dry conditions. Calculatethe aqueous Tension at 10oC.

Pdry gas = Pobserved - aqueous tensionAqueous tension =   Pobserved - Pdry gasPobserved = 0.9Pdry gas = ?According to combined gas law                            P1V1T1 = P2V2T2Experimental condition    STP conditionPressure of dry gas P1 = P2V2T2 × T1V1   = 1× 0.080283 × 2730.1 = 0.7717 atmAqueous tension =   Pobserved - Pdry gas = 0.9 - 0.7717 atm = 0.1283 atm

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