Short Answer TypeHow is Dalton's law of partial pressures useful in calculating the pressure of a dry gas?
Long Answer Type300 mL of a gas A at a pressure of 600 mm is mixed with 200mL of another gas B at a pressure of 700 mm in a vessel of 2-litre capacity. What will be the total pressure of the resulting mixture, if the temperature is kept constant?
What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C?
A neon-dioxygen mixture contains 70.6 g dioxygen and 167·5 g neon. If pressure of the mixture of gases in the cylinder is 25 bar, what is the partial pressure of dioxygen and neon in the mixture?
Short Answer TypeA mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
Long Answer TypeCalculate the total pressure in a mixture of 8g of dioxygen and 4g of dihydrogen confined in a vessel of 1 dm3 at 27°C. R = 0·083 bar dm3 k–1 mol–1.
Short Answer TypeLong Answer TypeOutline the basic assumptions/postulates of kinetic theory of gases.
The important assumptions/postulates of kinetic theory of gases are:
(i) A gas consists of a large number of identical molecules of mass m. The dimensions of these molecules are very-very small as compared to the space between them. Hence the molecules are treated as point masses.
(ii) The molecules of a gas are always in a state of zig-zag motion. They collide with one another and with the walls of the containing vessel. The direction of motion and speed of the molecules change continuously.
(iii) The collisions between the gas molecules are perfectly elastic i.e. there is no loss of energy during these collisions.
(iv) There are practically no attractive forces between the molecules. The molecules, therefore, move independently.
(v) The pressure of the gas is the result of collisions of molecules with the walls of the container.
(vi) The average kinetic energy of the colliding molecules is directly proportional to its absolute temperature.
In view of those assumptions, the above model of a gas is called Kinetic Gas Model or Dynamic Particle Model.
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