100cc of gas is collected over water at `15^@C` and 750torr. If the gas occupies 91.9 mL in dry state at STP, find the aqueous tension at STP.

Explanation

Let aqueous tension at `15^@ C` is .f.
Given conditions STP conditions

Applying equation of state at two conditions,
` (P_1 V_1 )/(T_1) = (P_2 V_2)/(T_2) implies ((750 -f ) xx 100 )/( 288 ) =( 760 xx91.9 )/( 273 )`
750 -f =736.8
Aqueous tension .f at `15^@ C = 750-736.8 = 13.2 `mm.