Gas Laws Questions and Answers - Chemistry Form 3 Topical Revision

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Questions

  1. A sample of unknown compound gas X is shown by analysis to contain Sulphur and Oxygen. The gas requires 28.3 seconds to diffuse through a small aperture into a vacuum. An identical number of oxygen molecules pass through the same aperture in 20 seconds. Determine the molecular mass of gas X (O= 16, S= 32)
  2.  
    1. State Graham’s Law of diffusion
    2. Gas V takes 10 seconds to diffuse through a distance of one fifth of a meter. Another gas W takes the same time to diffuse through a distance of 10 cm. if the relative molecular mass of gas V is 16.0; calculate the molecular mass of W
  3.  
    1. State Charles’ Law
    2. The volume of a sample of nitrogen gas at a temperature of 291K and 1.0 x 105 Pascals was 3.5 x 10-2 m3. Calculate the temperature at which the volume of the gas would be 2.8 x 10-2 m3 at 1.0 x 10pascals.
  4. 60 cm3 of oxygen gas diffused through a porous partition in 50 seconds. How long would it take 60 cm3 of sulphur (IV) oxide gas to diffuse through the same partition under the sane conditions? (S = 32.0, O = 16.0)
  5.  
    1. State Graham’s law of diffusion
    2. 30cm3 of hydrogen chloride gas diffuses through a porous pot in 20 seconds. How long would it take 42cm3 of sulphur(IV) oxide gas to diffuse through the same pot under the same conditions (H =1 Cl = 35.5 S = 32 O =16)
  6.  
    1. State Boyles law
    2. Sketch a graph that represents Charles’ law
    3. A gas occupied a volume of 250 cm3 at -23º C and 1 atmosphere. Determine its volume at 127º C when pressure is kept constant.
  7. A factory produces Calcium Oxide from Calcium Carbonate as shown in the equation below:-
                  heat
    CaCO3 (s)  →   CaO (s) + CO2 (g)
    What volume of Carbon (IV) Oxide would be produced from 1000kg of Calcium Carbonate at s.t.p (Ca = 40, C = 12, O = 16, Molar gas volume at s.t.p = 22.4dm3)
  8. A fixed mass of gas occupies 200 cm3 at a temperature of 23oC and pressure of 740mmHg. Calculate the volume of the gas at -25oC and 780mmHg pressure
  9. Gas K diffuses through a porous material at a rate of 12cm3 s-1 where as S diffuses through the same material at a rate of 7.5cm3s-1. Given that the molar mass of K is 16, calculate the molar mass of S
  10. State Gay Lussac’s law
  11.  
    1. What is the relationship between the rate of diffusion of a gas and its molecular mass?
    2. A sample of Carbon (IV) Oxide takes 200 seconds to diffuse across a porous plug.
      How long will it take the same amount of Carbon (II) Oxide to diffuse through the same plug?(C=12, O=16)
  12. Below are structures of particles. Use it to answer questions that follow. In each case only electrons in the outermost energy level are shown
    key
    P = Proton
    N = Neutron
    X = Electron
    1. Identify the particle which is an anion
    2. Choose a pair of isotopes. Give a reason
  13. The figure below shows two gases P and Q diffusing from two opposite ends 18 seconds after the experiment
    1. Which of the gases has a lighter density?
    2. Given that the molecular mass of gas Q is 17, calculate the molecular mass of P
  14. Identify the particles that facilitate the electric conductivity of the following substances
    1. Sodium metal
    2. Sodium Chloride solution
    3. Molten Lead Bromide
  15. Gas B takes 110 seconds to diffuse through a porous pot, how long will it take for the same amount of ammonia to diffuse under the same conditions of temperature and pressure? (RMM of B = 34 RMM of ammonia = 17)
  16. A gas occupies 5dm3 at a temperature of -27oC and 1 atmosphere pressure. Calculate the volume occupied by the gas at a pressure of 2 atmospheres and a temperature of 127oC
  17. A fixed mass of gas occupies 200 cm3 at a temperature of 230c and a pressure of 740 mm Hg. Calculate the volume of the gas at -250c and 790 mm Hg pressure.
  18.  
    1. State the Graham’s law
    2. 100cm3 of Carbon (IV) oxide gas diffused through a porous partition in 30seconds. How long would it take 150cm3 of Nitrogen (IV) oxide to diffuse through the same partition under the same conditions? (C = 12.0, N = 14.0, O = 16.0)

Answers

  1.  
    gas laws ans1
  2.  
    1. The rate of diffusion of a gas is inversely proportional to the square root of its density under the same conditions of temperature and pressure





    2.  
      gas laws ans2
  3.  
    1. The volume of a fixed mass of a gas is directly proportional to its absolute temperature at constant Pressure
    2.  
      gas laws ans3b
  4.  
    gas laws ans4
  5.  
    1. The rate of diffusion of a fixed mass of a gas is inversely proportional to the square root of it density at constant temperature and pressure








    2.  
      gas laws ans5b
  6.  
    1. Boyles’ law For a fixed mass of a gas, volume is inversely promotional to pressure at constant temperature
    2.  
      charles law graph
      gas laws ans6c
  7.  
    gas laws ans7
  8.  
    gas laws ans8

  9.  
    gas laws ans9
  10. When gases combine they do so in volume which bear a simple ratio to one another and to the product if gaseous under standard temperature and pressure
  11.  
    1. Rate of diffusion is whereby proportional to molecular mass of a gas. √1
    2.  
      gas laws ans11b
  12.  
    1. Y √1
    2. Z and W √1 have same atomic number but different mass number. √1
  13.  
    1. Gas P
    2.  
      gas laws ans13b
  14.  
    1. Delocalized electrons
    2. Mobile ions
    3. Mobile ions
  15.  
    gas laws ans15
  16.  
    gas laws ans16
  17.  
    1.  
      gas laws ans17a
    2. 601 √1
  18.  
    1. Grahams law states
      Under the same conditions of pressure and temperature, the rate of diffusion of a gas is inversely proportional to the square root of its density
    2.  
      gas laws ans18b

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