Order States of Matter Discussion Assignment

Order States of Matter Discussion Assignment
1. The mean molar mass of a mixture of CO and CO2
is 32 g mol–1. What is the mole fraction of CO in it?
2. At 80qC the density of N2
O4
is found to be 25.8. Calculate the percentage by weight of NO2
molecules.
3. 1.78 u 1022 molecules of a gas trapped in a 200 ml flask exerted a pressure of 3.66 u 105
Nm2
at 298 K. Identify the
nature of the gas(ideal or real) and justify.
4. On heating a mixture of chlorine and an oxide of chlorine in equal volumes (30ml 30ml) and cooling to room temperature at the same pressure, the volume observed was 75 ml of which 60 ml were absorbed by alkali. Suggest the
formula of the oxide.
5. The fraction of partial pressure exerted by hydrogen in a mixture of equal masses of two gases (including hydrogen)
is 8/9 at 25qC. Identify the other gas.
6. The gaseous fluoride of an element contains 27% of the element. 50 ml of the gas diffuses under certain conditions in
25 seconds. Under the same conditions 100 ml O2
the gas diffuses in 27.7 seconds. What may be the probable atomic
weight of the element.
Order States of Matter Discussion Assignment
7. Calculate the rms speed, mean speed and most probable speed of N2
molecules at 27qC.
8. Calculate the compressibility factor of CO2
, given its density = 1.96 g L1
at 0qC and 1 atmospheric pressure.
9. The van der Waals constants, b for methane gas is 6.9 u 105
m3
mol1
. Find the molecular radius.
10. 2 litres of a gas at 40 atm and 27°C is compressed to 60 atm and 17°C. The compressibility factors are found to be 1.12
and 1.68, respectively. Calculate the final volume?
Which of the following properties can be seen exclusively in gases only?
(a) They intermix spontaneously.
(b) They fill the whole vessel in which they are placed.
(c) They exert pressure on the walls of the container.
(d) Their molecules are constantly in a state of motion