States of Matter
If the value of Avogadro numberis 6.023×1023mol−1 and the vaueof Boltzmann constant is 1.380×10−23JK−1, then the number of significant digits in the calculated value of the universal gas constant is
Pressure of 1 g ideal gas X at 300 K is 2 atm. When 2 g of another gas Y is introduced in the same vessel at same temperature, the pressure become 3 atm. The correct relationship between molar mass of X and Y is :
A mixture of C2H2 and C3H8 occupied a certain volume at 80 mm Hg. The mixture was completely burnt to CO2 and H2O(l). When the pressure of Co2 was found to be 230 mm Hg at the same temperature and volume, the mole fraction of CO3H8 in the mixture is :
80 mL of O2 takes 2 minutes to pass through the hole. What volume of SO2 will pass through the hole in 3 minute?
Which of the following change is observed occurs when a substance X is converted from liquid to vapour phase at the standard boiling point?
I. Potential energy of the system cecreases
II. The distance between molecules increases
III.The average kinetic energy of the molecules in both phases are equal
van der Waal's equation for calculating the pressure of a non ideal gas is
van der Waal's suggested that the pressure exerted by an ideal gas , Pideal, is related to the experiventally measured pressure, Pideal by the equation
Pideal=observed pressure↑Preal+currection term↑V2an2
Constant 'a' is measure of intermolecular interaction between gaseous molecules that gives rise to nonideal behavior. It depends upon how frequently any two molecules approach each other closely. Another correction concerns the volume occupied by the gas molecules. In the ideal gas equation, V represents the volume of the container. However, each molecule does occupy a finite, although small, intrinsic volume, so the effective volume of the gas vecomes (V-nb), where n is the number of moles of the gas and b is a constant. The term nb represents the volume occupied by gas particles present in n moles of the gas .
Having taken into account the corrections for pressure and volume, we can rewrite the ideal gas equation as follows :
corrected pressure(P+V2an2)corrected volume(V−nb)=nRT
For non-zero value of force of attraction between gas moleculer at large volume, gas equation will be :