The pressure of moist gas at a given temperature is 10 mm Hg at volume V. Aqueous tension at this temperature is 3 mm Hg point the final pressure of gas at the same temperature if the volume is reduced to 1/3 original volume is:
A
30mm Hg
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B
27mm Hg
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C
24mm Hg
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D
21mm Hg
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Solution
The correct option is B 24mm Hg
The moist gas has pressure =10mmHg, and aqueous tension =3mmHg
⇒ Pressure of dry gas =10−3=7mmHg
Now, volime V is reduced to V3.
SH constant T (Isothermai process):
P1V1=P2V2
⇒7×V=P1.V3
⇒P2=21mmHg. (paratial pressure of dry gas)
As it exists in moist form, final pressure =21+3=24mmHg