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Question

Solid phosphorus melts and evaporates at high temperature Gaseous phosphorus effuses at a rate that is times that of Ne in the same apparatus under the same conditions . How many atoms are in a molecule of gaseous phosphorus.

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Solution

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Let and be th rate of effusion of phosphorous and neon respectively.
Given thatΒ phosphorus effuses at a rate that is times that of Ne in the same apparatus under the same conditions.
As we know that, rate of effusion, 'r', of any gas of molar mass 'M' is given by-
Substituting the value of in , we have
.
From the formula,
Hence there are atoms in a molecule of gaseous phosphorus.

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