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At 273 K, the density of a certain gaseo...

At 273 K, the density of a certain gaseous oxide at 2 atm is same as that of dioxygen at 5 atm, The molecular mass of the oxide (in g `mol^(-1)` ) is

A

80

B

64

C

32

D

160

Text Solution

Verified by Experts

The correct Answer is:
A
We know that
`pV = nRT = (w)/(M) RT `
`pM = (w)/(V) RT`
`pM = dRT`
`or d = (pM)/(RT)`
`because` R and T are constant and `d_(1) = d _(2)`
`therefore p _(1) M _(1) = p _(2) M _(2)`
`2 xx M _(1) = 5 xx 32`
`M _(1) = ( 5 xx 32 )/(2) = 80 g mol ^(-1)`
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