. A certain quantity of gas occupies a volume of 0.1 L when collected over water at 150C
and a pressure 0.95atm .The same gas occupied a volume of 0.085 L at STP in dry conditions. Calculate the aqueous tension at 150C.
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P
drygas
=P
observed
−aqueoustension
Aqueoustension=P
observed
−P
drygas
P
observed
=0.92
P
drygas
=?
According to combine gas law
T
1
P
1
V
1
=
T
2
P
2
V
2
[Experimental condition STP condition]
pressure of dry gas
P
1
=
T
2
P
2
V
2
×
V
1
T
1
=
−245
1×0.085
×
0.1
273
=0.94714
Aqueous tension=P
observed
−P
drygas
=0.92−0.94714 atm= −0.02714
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