The average kinetic energy of oxygen molecules and hydrogen molecules will be the same at any particular temperature. If we keep in mind that the formula for kinetic energy is 0.5mv2 it stands to reason that the lighter molecules(hydrogen) will have a greater speed than the oxygen molecules. However the molecular mass of oxygen is 32 and that of hydrogen is 2. So we can rewrite the above expression Transforming the formula we obtain the expression below which gives the ratio of the average velocities of oxygen and hydrogen molecules The average velocity of hydrogen molecules is 4 times greater than that of oxygen molecules. It is important to note that although the average kinetic energy of all gases is the same at a particular temperature, the average velocity of the molecules is not. The heavier molecules tend to travel slower relative to the lighter ones. Page 2b) Draw a curve to show the distribution of energies for 2 mole of gas at 300 K Student answer Click the above link to see a possible student answer. Is the student's answer sufficient for 2 marks? If not what are the errors that you can point to. Solution
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