The density of phosphorus vapour at STP ...

The density of phosphorus vapour at STP is `5.54 " gL"^(-1)`. Hence, molecular formula of phosphorus is

A

`P_(2)`

B

`P_(3)`

C

`P_(4)`

D

`P_(8)`

Text Solution

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The correct Answer is:

C

`d=(Pm)/(RT)`
m (phosphorus)`=(dRT)/(p)=(5.54xx0.0821xx273)/(1)`
`=124.1 g" mol"^(-1)`
` :.` If molecular formula is `(p)_(x)` then 32x=124.1
x=4
Molecular formula=`p_(4)`

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