Gas Law Woorksheet

When scientists began to realize the relationship between the pressure, temperature and volume of a sample gas could be obtained which would hold true for all gases. Then they developed Gas Law.

Here you can find some questions related to gas law and their answers:


1. At what temperature in the celsius scale, V (volume) of a certain mass of gas at 27^0C will be doubled keeping the pressure constant?

(a)    54^0C

(b)   327^0C

(c)    427^0C

(d)   527^0C


2. 120 g of an ideal gas of molecular weight 40 g mole^{-1} is confined to a volume of 20 L at 400 K. Using R = 0.0821 L atm K^{-1} mole^{-1} ,the pressure of the gas is:

(a)    4.90 atm

(b)   5.02 atm

(c)    4.92 atm

(d)   4.96 atm


3. How many moles of He gas occupy 22.4 liters at 30^0 C and one atmospheric pressure?

(a)    0.90

(b)   1.11

(c)    0.11

(d)   1.0


4. 16 g of oxygen and 3 g of hydrogen are mixed and kept at 760 mm pressure and 0^0 C The total volume occupied by the mixture will be nearly:

(a)    22.4 liters

(b)   33.6 liters

(c)    448 liters

(d)   44800 ml


5. What will be the partial pressure of H_2 in a flask containing  2 g \text{of} H_2 , 14 g \text{of} N_2 \text{and} 16 g \text{of} O_2:

(a)    1 / 2 the total pressure

(b)   1/ 3 the total pressure

(c)    1 / 4 the total pressure

(d)   1/16 the total pressure


6. 50 volumes of H_2 take 25 minutes to diffuse out of vessel. How long will 40 volumes of oxygen take to diffuse out from the same vessel under similar conditions?

(a)    20 min

(b)   80 min

(c)    200 min

(d)   100 min


7. The total kinetic energy of 2 moles of an ideal gas at 127^0C is (use R = 8.3 JK^{-1}mol^{-1}):

(a)    9.96 kJ

(b)   19.92 kJ

(c)    3.32 kJ

(d)   39.84 kJ


8. The density of air is 0.00130 g/ ml. The vapour density of air will be:

(a)    0.00065

(b)   0.65

(c)    14.4816

(d)   14.56.


9. Volume of 4.4 g of CO_2 at NTP is:

(a)    22.4L

(b)   44.8L

(c)    2.24L

(d)   4.48L


10. What will be total pressure exerted by 16 g O_2, 22 g CO_2 in a 2 liter flask at 27^0C

(a)    12.3 atm

(b)   13.8 atm

(c)    15.6 atm

(d)   16.4 atm


12. 5.75 g of a gas has a volume of 3.4 liter at 50^0C and 0.94 atm. What is its molecular weight?

(a)    44

(b)   47.6

(c)    64

(d)   32


13. Two similar balloons are filled with H_2 \text{and} O_2 at same temperature and pressure. If O_2 escapes at the rate of 65 ml/ hour. What will be the rate of escape of hydrogen:

(a)    130 ml / hr

(b)   230ml/hr

(c)    260 ml/ hr

(d)   32.5 ml/hr


14. The relative diffusion of gas B as compared to a diatomic gas A is 6.5. What will be the molecular weight of B, if atomic weight of A is 36:

(a)    2.2

(b)   1.0

(c)    24

(d)   1.7


15. If 1.5 g of gas has 195 ml volume at 12^0C and 49 mm pressure, its molecular weight is:

(a)    278

(b)   270

(c)    178

(d)   275


1.(b)        2. (c)       3. (a)       4. (d)      5. (a)

6. (b)       7. (a)       8. (d)       9. (c)      10. (a)

11. (b)      12. (c)     13. (d)     14. (a)

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