Q.20 The equal masses of neon,ammonia,oxygen and sulphur dioxide gases are kept in a vessel at same temperature then these gases are suddenly allowed to comes out from the vessel.The gas having maximum K.E and diffused rapidly is
A) Neon
B) Ammonia
C) Oxygen
D) Sulphur dioxide
Correct Ans: B
Explanation: According to Graham's law of diffusion of gases,the lighter gas diffuse rapidly and according to Kinetic interpretation of temperature the average K.E of each molecule of any gas at same temperature is equal to each other but total K.E will be greater for that gas which have greater number of moles or molecules.
So,formula used
moles(n) = mass(m)/Molar mass(Mr)
Suppose the equal mass of each gas = 1 g
nNH3 = 1 / 17
nNe = 1 / 20.18
nO2 = 1 / 32
nSO2 = 1 / 64
So NH3 is lightest gas(least molar mass) among the above gases and it has greater number of moles or molecules.NH3 will move faster and having maximum K.E.
A) Neon
B) Ammonia
C) Oxygen
D) Sulphur dioxide
Correct Ans: B
Explanation: According to Graham's law of diffusion of gases,the lighter gas diffuse rapidly and according to Kinetic interpretation of temperature the average K.E of each molecule of any gas at same temperature is equal to each other but total K.E will be greater for that gas which have greater number of moles or molecules.
So,formula used
moles(n) = mass(m)/Molar mass(Mr)
Suppose the equal mass of each gas = 1 g
nNH3 = 1 / 17
nNe = 1 / 20.18
nO2 = 1 / 32
nSO2 = 1 / 64
So NH3 is lightest gas(least molar mass) among the above gases and it has greater number of moles or molecules.NH3 will move faster and having maximum K.E.
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