Advertisements
Advertisements
Question
1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure of 40 torr. The vapour pressure of pure A and pure B are 45 torr and 30 torr, respectively. The above solution ______.
Options
is an ideal solution
shows positive deviation
shows negative deviation
is a maximum boiling azeotrope
Solution
1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure of 40 torr. The vapour pressure of pure A and pure B are 45 torr and 30 torr, respectively. The above solution shows positive deviation.
Explanation:
If the actual pressure is lower than the expected pressure, the solution will have a negative deviation. If the actual pressure is greater than the expected pressure, the solution will display a positive deviation. If the actual pressure equals the expected pressure, the solution will be ideal.
XA = `1/(1 + 2) = 1/3`
XB = `2/(1 + 2) = 2/3`
PT = `"P"_"A"^0 xx "A" + "P"_"B"^0 xx "B"`
= `45 xx 1/3 + 30 xx 2/3`
= 35 torr
However, the actual pressure i.e. 40 torr, is greater than the expected pressure. As a result, the solution will have a positive deviation.
APPEARS IN
RELATED QUESTIONS
What role does the molecular interaction play in a solution of alcohol and water?
Vapour pressure of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot `"P"_"total"`, `"P"_"chloroform"` and `"P"_"acetone"` as a function of `"x"_"acetone"`. The experimental data observed for different compositions of mixtures is:
| `bb(100 xx "x"_"acetone")` | 0 | 11.8 | 23.4 | 36.0 | 50.8 | 58.2 | 64.5 | 72.1 |
| `bb("P"_"acetone"//"mm Hg")` | 0 | 54.9 | 110.1 | 202.4 | 322.7 | 405.9 | 454.1 | 521.1 |
| `bb("P"_"chloroform"//"mm Hg")` | 632.8 | 548.1 | 469.4 | 359.7 | 257.7 | 193.6 | 161.2 | 120.7 |
Plot this data also on the same graph paper. Indicate whether it has a positive or negative deviation from the ideal solution.
The KH for the solution of oxygen dissolved in water is 4 × 104 atm at a given temperature. If the partial pressure of oxygen in air is 0.4 atm, the mole fraction of oxygen in solution is ______.
Two liquids X and Y on mixing gives a warm solution. The solution is ______.
For ideal solution the volume of mixing of the pure components to form the solution is ____________.
The rate at which a solid dissolves in liquid does not depend on ____________.
Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.
Why soda water bottle kept at room temperature fizzes on opening?
On increase in pressure for dissociation ofN2O4 into NO2, equilibrium shift towards
Suggest the most important type of intermolecular attractive interaction in the following pair.
I2 and CCl4
