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100cc of gas is collected over water at ...

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.

Text Solution

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Let aqueous tension at `15^(@)C`is .f.
`{:("Given conditions",,"STP conditions"),(P_(1) = (750-f)"mm",,P_(2) = 760"mm"),(V_(2) = 100 "mL",,V_(2) = 91.9"mL"),(T_(1) = 288"K",,T_(2) = 273 "K"):}`
Applying equation of state at two conditions,
`(P_(1)V_(1))/(T_(1)) = (P_(2)V_(2))/(T_(2)) = ((750-f) xx100)/(288) = (760 xx 91.9)/(273)`
` = 750-f = 736.8`
Aqueous tension .f. at `15^(@)C = 750-736.8 = 13.2` mm
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