Question

Which one of the following tatement i correct?

In a ample of air at a given temperature,

Select one:

a. The nitrogen and oxygen molecule have different average kinetic energy. B. The nitrogen and oxygen molecule have different average peed. C. All nitrogen molecule move fater than all oxygen molecule. D. All nitrogen molecule move lower than all oxygen molecule. E. Ome molecule are not moving

Answer 1

Option B is correct. average speed of the nitrogen and oxygen molecule have different average speed  as average sped is inversely propertional to molar mass.

Average kinetic energy of any gaseous molecule is dependent on temperature.so any particle either nitrogen or oxygen have same average kinetic energy. Kinetic energy is fixed at any temperature.so, option A is not correct.

Average speed is dependent on the temperature as well as molar mass of the gas particle. Temperature fixed by nitrogen has molar mass of 14 and molar mass of oxygen is 16. Average speed is inversely proportional to molar mass. Nitrogen have higher average speed than oxygen.so, the option B is correct.

Even though the the average speed of the nitrogen molecule are higher than of average speed of oxygen molecule there will be some molecule of nitrogen which will more slower than oxygen. and there always be some molecule of nitrogen which will move faster than oxygen molecule.

so, the statement C , all the nitrogen molecule move faster than all the the oxygen molecule is not correct and option D, all the nitrogen molecule move slower than all the oxygen molecule is not correct.

All the molecules always move. they get some energy from surrounding and always move.so, statement E is not correct.

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