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

1. A. 0.2 kg/m 3
2. B. 0.1 kg/m 3
3. C. 0.02 kg/m 3
4. D. 0.5 kg/m 3

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