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CLASS XI
Chemistry >> GASEOUS STATE
1.
A mixture of helium and water vapour was sent into a hollow steel cylinder containing a solid drying agent. Immediately after admission the pressure inside the cylinder was 600 mm of Hg. After standing for some hours the pressure decreased slowly to a steady value of 560 mm of Hg. (i) calculate the mole percent of helium in the original mixture. (ii) If the temperature during experiment was 22°C and the drying agent registered a weight increase of 0.27 g, find the volume of the steel cylinder. The volume occupied by the drying agent may be taken to be negligible.
Ans.
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(i) The decrease in pressure from initial value of 600 mm to final value of 560 mm is due to complete absorption of water vapour by the drying agent.
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