Which statement best explains why different gases effuse at different rates?
2 answers:
Answer: Different gases effuse at different rates because at a given temperature, gas particles with smaller masses move faster.
Explanation: The motion of particles in a gas depends on the kinetic energy of the gas particles which further depend on the temperature of the gas. Thus, the rate of gas given by Graham's law can only be stated when the two gases are at fixed temperature.
Graham's Law: This law states that the rate of effusion of gas is inversely proportional to the square root of its mass.
Mathematically,
From the above relation, the gas particle with smaller mass will effuse faster at a given temperature.
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Answer: True
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.
is positive when randomness increases and
is negative when randomness decreases.
When the solid changes to liquid to gas ,the randomness of particles increases and hence is positive and thus the entropy increases.