Degree of dissociation and vapour density

27 questions on Degree of dissociation and vapour density from the Chemical Equilibrium chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• For the dissociation PCl5(g) <=> PCl3(g) + Cl2(g), let D be the vapour density calculated for undissociated PCl5 and d the vapour density of the equilibrium mix... NEET level
• N2O4(g) <=> 2NO2(g) is 50\% dissociated at a certain temperature and pressure. Taking the molar mass of N2O4 as 92 g/mol, the average molar mass of the equilibr... NEET level
• For PCl5(g) <=> PCl3(g) + Cl2(g) the calculated vapour density of undissociated PCl5 is 104.25. If the compound is 25\% dissociated, the vapour density of the e... NEET level
• NH4Cl(g) <=> NH3(g) + HCl(g) has a calculated vapour density of 26.75 for undissociated NH4Cl (molar mass 53.5 g/mol). If dissociation is complete, the vapour d... NEET level
• One mole of PCl5 dissociates to the extent of 30\% in a closed vessel. The total number of moles of gas at equilibrium is NEET level
• The vapour density of an equilibrium mixture of PCl5, PCl3 and Cl2 is found to be 80 (calculated value for undissociated PCl5 is 104.25). The degree of dissocia... JEE Main level
• The average molar mass of an equilibrium mixture of N2O4 and NO2 is 69 g/mol (molar mass of N2O4 = 92 g/mol). The degree of dissociation of N2O4 is JEE Main level
• PCl5 is placed in a rigid vessel and allowed to dissociate at constant temperature. The pressure at equilibrium is 1.40 times the initial pressure. The degree o... JEE Main level
• Vapours of NH4Cl (calculated vapour density 26.75 for undissociated NH4Cl) have an observed vapour density of 15 at a certain temperature through NH4Cl(g) <=> N... JEE Main level
• PCl5 is 40\% dissociated at a total equilibrium pressure of 2.0 atm for PCl5(g) <=> PCl3(g) + Cl2(g). K_p (in atm) is JEE Main level
• The equilibrium vapour density of a PCl5 sample that partially dissociates is 70 (calculated value for undissociated PCl5 is 104.25). Find the percentage dissoc... JEE Main level
• N2O4(g) <=> 2NO2(g) is 20\% dissociated at a total pressure of 1.0 atm. Find K_p in atm, to two decimal places. JEE Main level
• N2O4 is 25\% dissociated into NO2 at 300 K and a total pressure of 1.00 atm. Use R = 0.0821 L atm mol^-1 K^-1 and M(N2O4) = 92 g/mol. The density of the equilib... JEE Main level
• A gas A of molar mass 120 g/mol dissociates as A(g) <=> B(g) + 2C(g) to the extent of 55\%. The average molar mass of the equilibrium mixture in g/mol, to one d... JEE Main level
• An equilibrium mixture obtained from PCl5(g) <=> PCl3(g) + Cl2(g) has vapour density 80; the calculated value for undissociated PCl5 is 104.25. Select the corre... JEE Main level
• The following gaseous reactions are started from the pure reactant. At constant temperature and pressure, for which does the vapour density of the mixture becom... JEE Main level
• A sealed vessel of volume 2.0 L contains 8.34 g of PCl5 (molar mass 208.5 g/mol) which dissociates by PCl5(g) <=> PCl3(g) + Cl2(g). The vapour density of the eq... JEE Advanced level
• The density of an equilibrium mixture of N2O4 and NO2 is 2.70 g/L at 300 K and 1.00 atm. Take R = 0.0821 L atm mol^-1 K^-1 and M(N2O4)=92. The degree of dissoci... JEE Advanced level
• PCl5 (calculated vapour density 104.25 when undissociated) dissociates at a total equilibrium pressure of 2.0 atm, and the vapour density of the mixture is 62. ... JEE Advanced level
• N2O4(g) <=> 2NO2(g) is 20\% dissociated at a total pressure of 1.0 atm and temperature T. At the same temperature the total pressure is raised to 3.0 atm. The n... JEE Advanced level
• NH3 (calculated vapour density 8.5) partly decomposes by NH3(g) <=> 1/2 N2(g) + 3/2 H2(g). The vapour density of the equilibrium mixture is 6.8. The degree of d... JEE Advanced level
• 20.85 g of PCl5 (molar mass 208.5 g/mol) is heated in a 5.00 L vessel at 500 K and the equilibrium total pressure is 1.50 atm. Use R = 0.0821 L atm mol^-1 K^-1.... JEE Advanced level
• An equilibrium mixture of N2O4(g) and NO2(g) has density 2.53 g/L at 350 K and a total pressure of 1.00 atm. Use R = 0.0821 L atm mol^-1 K^-1 and M(N2O4)=92. Fi... JEE Advanced level
• PCl5 (calculated vapour density 104.25 when undissociated) partly dissociates at a total equilibrium pressure of 2.0 atm and the vapour density of the mixture i... JEE Advanced level
• Two moles of PCl5(g) dissociate in a vessel held at constant temperature, and at equilibrium the total pressure is 3.0 atm and the vapour density of the mixture... JEE Advanced level
• N2O4(g) (M = 92 g/mol) is 25\% dissociated into NO2(g) at constant temperature and pressure. Select the correct statements. JEE Advanced level
• A gas A dissociates as A(g) <=> nB(g) (n geq 2 integer) with degree of dissociation alpha, starting from 1 mol at constant T and P. D is the calculated vapour d... JEE Advanced level