Gaseous and liquid states Questions and Answers

6 How many moles of lead II chloride will be formed from a reaction between 6 5 g of Pbo and 3 2 g HC1I a 0 011 b 0 029 c 0 044 d 0 333 2008

The eq wt of Na S O as reductant in the reaction 2 2 3 Na S O3 H O Cl Na SO4 2HCl S is 2 Mol wt 2 4 Mol wt 8 1 Mol wt 1 3 Mol wt 6 mA

Gaseous N O4 dissociates into gaseous NO according to the reaction N O4 8 2NO g At 300 K and 1 atm pressure the degree of dissociation of N O4 is 0 2 If one mole of N O4 gas is contained in a vessel then the density of the equilibrium mixture is 1 1 56 g L ed 2 3 11 g L 3 4 56 g L 4 6 22 g L

8 In which case is the number of molecules of water maximum a 0 00224 L of water vapours at 1 atm and 273 b 0 18 g of water c 18 mL of water d 103 mol of water

The following equations of state are occasionally used for approximate calculation on gases b Gas X PV RT 1 V m Gas Y P Vm b RT Assuming that gas X and Y actually obeyed above equation of state respectively then choose the correct statement A Gas X is more liquefiable than Gas Y B Gas X and Y both are liquefiable C Neither Gas X nor Gas Y is liquefiable D Gas Y is more liquefiable than Gas X

7 What volume of gaseous NH at 0 C and 1 atm will be required to be passed into 30 ml of N H SO4 solution to bring down the acid strength of this solution to 0 2 N a 537 6 ml c 1075 2 ml b 268 8 ml d 371 3 ml

Q Assuming the force constant to be the same for H O and D O A normal mode for H O is at 3650cm Do you expect the corresponding D O wave number to be higher or lower Q Calculate the vibrational frequency of CO given the following data mass of C 12 01 amu mass of O 16 amu the force constant k 1 86 10 kg s

The volume of a drop of water is 0 0018 m then the number of water molcules present two drops of water at room temperatue is 1 12 046 x 1019 2 1 084 x 1018 3 4 84 x 10 7 4 6 023 x 1023

The above experiment is done at NTP The stop cock is opened for certain time and then closed After effusion the bulb A contains 0 1 gm of D Find out the number of mole of H in bulb B Balloon A is inserted in balloon B at 300 K Maximum 1 12 It D 2 24 It H B evacuated

4 For two gases A and B with molecular weights MA and MB it is observed that at a certain temperature T the mean velocity of A is equal to the root mean square velocity of B Thus the mean velocity of A can be made equal to the mean velocity of B if a A is at temperature T and B at T T T b A is lowered to a temperature T T while B is at T c both A and B are raised to a higher temperature d both A and B are placed at lower temperature

3 A vessel of volume 10 L is evacuated by means of a piston air pump One piston stroke captures the volume 1 L The process is assumed to be isothermal and the gas is ideal The initial pressure of gas in the vessel was 24 2 atm Select the correct statement s from the following a The pressure of gas remained in the vessel after first stroke is 22 atm b The pressure of gas remained in the vessel after second stroke is 20 atm c The number of strokes needed to reduce the In n In 1 1 pressure in the vessel n times is d The pressure of gas remained 10 after n strokes is 24 2 x n in the vessel atm

Which one of the following form maximum boiling point azeotrope 1 CHCl3 C H5OH 3 Benzene toluene 2 Ethanol water 4 HCI water

nT The figure below shows the plot of gas at two different temperatures BHU 2006 AIIMS 2007 J mol K PV nT EEE P Read the following statements concerning the above curves i The dotted line corresponds to the ideal gas behaviour ii T T versus P for oxygen T2 T iii The value of PV nT on the y axis is the same for all gases a i only c All of these Which of the above statement is true at the point where the curves me b i and ii only d None of these

4 Calculate the strength in percentage W V moles per litre or molarity number of gram equivalents of the solute and normality of the following solutions i 9 125 g of HCl in 200 mL of its aqueous solution ii 60 g of NaOH in 3 L of its aqueous solution iii 14 7 g H SO4 in 500 mL of its aqueous solution iv 296 g Ca OH 2 in 10 L of its aqueous solution

For every 33 feet beneath the surface of the ocean the pressure increases by 1 0 atm A fish having had too rich a lunch burps and the resultant bubble rises toward the surface When released at a depth of 198 ft the bubble had a volume of 12 mL and a temperature of 3 0 C The conditions at the surface of the ocean are 23 C and 0 97 atm of pressure What will the volume of the bubble be when it reaches the surface

Side arm of an open end mercury manometer is attached to a gaseous system The level of mercury in the arm attached to the system is 125 mm lower than the open end arm What is the pressure of the gaseous system if atmospheric pressure is 760 mm Hg

b For the complete combustion of methane gas according to the equation CH4 g O2 g H20 g CO2 g The density of CO2 gas fully collected in a cylinder with a piston fixed at 273k and 760 mm HG is 1 788 g L What is the molecular weight of the gas

4 0 g of argon has pressure P and temperature T K in a vessel On keeping the vessel at 50 higher temperature 0 8 g of argon was given out to maintain the pressure P The original temperature was A 73 K B 100 K C 200 K D 510 K

WBSU Year 2011 3 c Determine the effect of introducing an inert gas keeping pressure of the system constant on the position of equilibrium of the following reaction N2 g 3H g 2NH3 g 3

One mole of an ideal gas expands from 5L to 15 L at 300 K temperature against a constant external pressure 2 atm then Take 1 atm L O Enthalpy change of the gas 0 Change in internal riesgy at the grow it O Heat absorbed by the gas 2 kJ

One mole of an ideal gas expands under isobaric conditions If during expansion temperature of the gas increases by 1 C then work done by the gas is Cmp and Cm v are molar heat capacities at constant pressure and constant volume respectively Cm p O Cmp Cm v O Cm v Cm v Cm p

50 g of dinitrogen N and 2 0 g of helium were enclosed in a vessel already containing 2 0 g of oxygen Calculate the total pressure and the fraction of the total pressure exerted by He The volume of vessel is 10 dm and the temperature is 300 K

Methane gas CH4 effuses through a barrier at a rate of 0 340 ml minute If an unknown gas effuses through the same barrier at a rate of 0 205 ml minute what is the molar mass of the gas O 5 83 g mol O 44 1 g mol O 9 67 g mol O 0 171 g mol O 26 6 g mol

A flask of 1 5 L capacity contains 400 mg of O and 60 mg of H at 100 C Calculate the total pressure of the gaseous mixture If the mixture is permitted to react to form water vapours at 100 C what materials will be left and what will be their partial pressures

A sample of hard water contains 2 mg CaCl and 2 mg MgCl2 per liter Calculate the hardness of water in terms of CaCO3 present in 106 parts of water Molar mass of CaCl 111 g mol MgCl2 95 g mol and CaCO3 100 g mol O 1 95 ppm O 2 50 ppm 3 90 ppm O 1 25 ppm

Regarding non ideal behaviour of gases choose the correct statements Gas which behave ideally over a large range of pressure at Boyle s temperature is easy to liquify Vanderwaal constant b is larger for Ar than Ne gas The value of Boyle s temperature increases with the strength of attractive interaction between molecules Pressure exerted by 1 mole O is greater than 1 mole H O at 350K if both gases are present in same volume

Determine the mass in grams of oxygen obtained when 567 mL gas was collected over water at 1 402 atm and 85 0 C The vapour pressure of water is 433 6 mmHg at 85 0 C 2 Ag2O s 4 Ag s O g You must use the values of the constants and any conversions given on the Exam 4 Periodic Tables and Constants Attachment If you use any other source that gives you an imprecise or incorrect answer you may not receive credit for the question Your Answer

Compared to chlorine gas Cl2 MW 70 9 the average speed of a carbon monoxide molecule CO MW 28 0 is a 2 5 times faster d 2 5 times slower b 1 6 times faster 1 6 times slower c 0 63 times faster f 0 63 times slower

30 A special gas mixture used in bacterial growt chamber contains 1 by weight of CO and 99 of O What is the partial pressure in atm of eac gas at a total pressure of 0 977 atm 1 Po 0 970 atm Pco 0 1 atm 2 Po 0 970 atm Pco 0 00711 atm 3 Po 0 1atm Pco 0 9 atm 4 Can t predict

Question 7 It was determined that 63 5 kJ of heat is needed to vaporize enough aniline CH NH liquid at its normal boiling point of 184 C to produce 45 0 L of aniline vapor at the normal atmospheric pressure of 1 atm Calculate the enthalpy of vaporization of aniline in kJ mol You must show every step of the calculation Hint you may need to use the ideal gas law to solve this problem 4 points

26 The vapour pressure of two pure liquids P and Q that form an ideal solution a 100 torr and 400 torr respectively at a temperature T This liquid solution of Par Q is composed of 1 mole of P and 1 mole of Q What will be the pressure when mole of mixture has been vapourised A 200 torr B 300 torr D 700 torr Q No 26 C 500 torr

3 60 amu 4 55 amu 45 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded Volume of gaseous product after reaction 1 1 22 4 L X 2 2 22 4 L 3 3 22 4 L 4 4 22 4 L 46 What is the OH in the final solution prepared by

b Use the following phase diagram to answer the following questions L A L A B 50 Wt b D i Determine the degree of freedom at point e ii Determine the degree of freedom at point A L iii Determine the degree of freedom at point B L iv Determine the degree of freedom at point A B 4 B L 100 To Ty

2SO 0 2S03 Observed mole fraction for a certain equilibrium mixture at 1000 K and 1767 torr are Xso 0 310 Xo 0 250 and Xso 0 440 a Find Kg and AG at 10 K assuming ideal gases b Find Kp at 100 K c Find the Kg at 1000 K

7 02 g of benzene containing 0 122 g of benzoic acid freezes at 0 512 C below the freezing point of pure benzene benzoic acid exists as a dimer during this van t Hoff factor is found to be x x 10 1 and degree of association y Kf for benezene is 5 12 K molal The value of x is

11 A gas balloon having a volume of 10 0 L at 25 C and 1 atm pressure rises to an altitude where the temperature is 10 C and pressure 500 mm of Hg What is the volume of balloon at this altitude above the 100

collowing plots correctly the variation in rate of and rate of condensation with time for a liquid in a closed container Rate of vaporization representing evaporation A Rate B Rate C D Rate Rate Rate of condensation Time Rate of vaporization 7 Rate of condensation Time Rate of vaporization Rate of condensation Time Rate of vaporization Rate of condensation Time

2 The variation of amount of gas adsorbed per gram of adsorbent with pressure at different temperatures is given in the figure below Amount of gas adsorbed T T T3 Pressure Which of the following is the correct relation b T T T3 d T T T3 a T T T3 c T3 T T

1 A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends the white ammonium chloride ring first formed will be 1 At the centre of the tube 2 Near the hydrogen chloride bottle 3 Near the ammonia bottle 4 Throughout the length of the

Given that the a and b constants of the van der Waals equation for acetylene gas are 4 516 ba L mol 2 and 0 0522 L mol respectively For this gas ESTIMATE i the second and third virial coefficients at 300 K ii at what temperature the second virial coefficient to be zero

If both gases NH3 and HCI are released at the same time then white precipitate will be formed near the point shown in figure NH A B C 1 A 2 B 3 C A Procinitate will not be formed HCI

is the final temperature What volume of O at 2 00 atm pressure and 27 C are required to burn 10 0 g of heptane C H 6 16 C H16 1102 7CO 8H 0 The mass of 525 cm of a gaseous compound at 28 C

the walls greater 7 Calculate the pressure of 1 x 1022 molecules of sulphur dioxide in pascal when enclosed in a vessel of 2 5 dm capacity at 300 K at B Calculate the pressure exerted by 56 g of an ideal 1 1 onglosed in a vessel

D A gas cylinder having a volume of 25 0 L contains a mixture of butane CH CH CH and isobutane CH CH in the ratio of 3 1 by moles If the pressure inside the cylinder is 6 78 x 106 Pa and the temperature is 298 K calculate the number of molecules of each gas assuming ideal behaviour 1 atm 101325 Pa 25 0

Task 6 1d Suppose you make a data set by measuring the pressure P at different x and x in an experiment for a binary mixture Suggest a procedure to estimate an optimum value for the coefficient A in the activity model by minimizing the error between calculated pressure using models and measured pressure

5 The stopcock connecting two bulbs of volume 5 litres and 10 litres containing an ideal gas at 9 atm and 6 atm respectively is opened What is the final pressure in the two bulbs if the temperature remians constant 1 15 atm 3 12 atm 2 7 atm 4 21 atm

About 8 0 x 106 tons of urea NH2 2CO are used annually as a fertilizer The urea is prepared at 200 C under high pressure conditions from carbon dioxide and ammonia the products are urea and steam Calculate the volume of ammonia in liters measured at 147 atm needed to prepare 3 87 tons of urea Assume ideal behavior Find the answer in scientific notation

Dipole induced dipole interactions are present in which of the following pairs NEET 2013 1 Cl and CCI 2 HCI and He atoms 3 SiF and He atoms 4 H O and alcohol

Equal masses of H O and methane have been taken in a container of volume V at temperature 27 C in identical conditions The ratio of the volumes of gases H 0 methane would be AIPMT 2014 2 2 2 16 8 1 1 8 16 1 3 16 1 2 LA

5pts Given that Analyte X has a Kd 1250 H 0 05 and solubility in water 25 mg L and is present in water at 12 mg L sediment at 300 mg kg and air at lug L Determine the compartment most likely to a gain X and b lose X