In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.a)dC/dz0b)dC/dz

Question

In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.a)dC/dz>0b)dC/dz<0c)dC/dz=0d)None of the MentionedCorrect answer is option 'B'. Can you explain this answer?

Answer

Explanation:

Mass transfer will occur spontaneously when there is a concentration gradient, meaning that the concentration changes with distance. In this case, mass will naturally move from high concentration areas to low concentration areas.

Key Points:
- dC/dz<0: This condition indicates that the concentration decreases as distance increases.
- Therefore, mass transfer will occur spontaneously in this scenario as there is a concentration gradient driving the movement of mass from high to low concentration areas.
- When dC/dz is negative, it implies that the concentration is decreasing with increasing distance, leading to a spontaneous mass transfer process.

Therefore, option 'B' (dC/dz<0) is the correct condition for spontaneous mass transfer to occur.

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