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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

`0.5kg//m^3`

B

`0.2kg//m^3`

C

`0.1kg//m^3`

D

`0.02kg//m^3`

Text Solution

Verified by Experts

The correct Answer is:
B
`PM_w = rho RT`
`rArr rho = (PM_w)/(RT)`
`P = 249 xx 10^3 N //m^2`
`M_w = 2xx 10^(-3) kg`
T = 300 K
`:.rho = ((249 xx 10^3) (2xx 10^(-3))/(8.3 xx 300) = 0.2 kg //m^3`
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