The table below shows the density of a sample of a mystery liquid you tested in the lab. Can you infer the identity of the subst
ance from these data?
A. Yes, the substance must be water.
B. No, more data are needed.
C. No, the data must be wrong because density always decreases with an increase in temperature.
D. Yes, but only if the data for 50ºC and 70ºC were also present.
A. Yes, the substance must be water.
B. No, more data are needed.
C. No, the data must be wrong because density always decreases with an increase in temperature.
D. Yes, but only if the data for 50ºC and 70ºC were also present.
1 answer:
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Explanation:
The given data is as follows.
T = = (120 + 273.15)K = 393.15 K,
As it is given that it is an equimolar mixture of n-pentane and isopentane.
So, = 0.5 and
= 0.5
According to the Antoine data, vapor pressure of two components at 393.15 K is as follows.
(393.15 K) = 9.2 bar
(393.15 K) = 10.5 bar
Hence, we will calculate the partial pressure of each component as follows.
=
= 4.6 bar
and,
=
= 5.25 bar
Therefore, the bubble pressure will be as follows.
P =
= 4.6 bar + 5.25 bar
= 9.85 bar
Now, we will calculate the vapor composition as follows.
=
= 0.467
and,
=
= 0.527
Calculate the dew point as follows.
= 0.5,
= 0.5
= 0.101966
P = 9.807
Composition of the liquid phase is and its formula is as follows.
=
= 0.5329
=
= 0.467