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Q.

The density of phosphorus vapour at STP is 5.54 gL-1. Hence, molecular formula of phosphorus is

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a

P2

b

P3

c

P4

d

P8

answer is C.

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Detailed Solution

d=pmRTm (phosphorus) =dRTp=5.54×0.0821×2731=124.1gmol−1 If molecular formula is (p)x then 32x=124.1x=4 Hence, P4.
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The density of phosphorus vapour at STP is 5.54 gL-1. Hence, molecular formula of phosphorus is