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A cylinder contains hydrogen gas at pres...

A cylinder contains hydrogen gas at pressure of `249 kPa` and temperature `27 degree C`. Its density is (`R=8.3J mol^-1K^-1`)

A

` 0.2 kg// m^(3)`

B

` 0.1 kg//m^(3)`

C

` 0.02 kg//m^(3)`

D

` 0.5 kg//m^(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
As we know that
`PM = rho RT `
` rArr rho = (PM)/(RT)`
Here ,` rho = 249 xx 10 ^(3) N//m^(2)`
` M =2 xx 10 ^(3) kg, T = 300 K`
` therefore rho = ((249 xx 10^(3)) (2xx 10 ^(-3) ))/(8.3 xx 300) = (0.2 kg )/(m^(3)) `
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