Which statement is true according to the kinetic theory?


Asked by maham237 @ in Chemistry viewed by 313 People


Molecules of different gases with the same mass and temperature always have the same average density.
Molecules of different gases with the same mass and temperature always have the same average volume.
Molecules of different gases with the same mass and temperature always have the same pressure.
Molecules of different gases with the same mass and temperature always have the same molecular mass.
Molecules of different gases with the same mass and temperature always have the same average kinetic energy.
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Answered by maham237 @



The true statement is that different gases with the same mass and temperature always have the same average kinetic energy. This is one of the postulates of the kinetic theory of matter.

If we two objects A and B, they will have mass m_A and m_B and velocity v_A and v_B respectively. If K.E = \frac{1}{2} mv^2. Then it follows that

\frac{1}{2}m_Av_A = \frac{1}{2} m_Bv_B. Since the mass is the same it means the velocity of the two objects should be the same so that they have the same average kinetic energy.


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