A mixture containing 1.12 litres of...
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A mixture containing 1.12 litres of H2 and 1.12 litres inside a bulb connected to another bulb by a stop-COCK V bulb is fully evacuated, the stop-cock is opened for a certain bulb is now found to contain 0.05 g of H2. Determine of the gases in the second bulb. Or H2 and 1.12 litres of D2 (deuterium) at N.T.P., is taken er bulb by a stop-cock with a small opening. The second COCK is opened for a certain time and then closed. The first ain 0.05 g of H2. Determine the percentage composition by weight

JEE/Engineering Exams
Chemistry
Solution
251
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Rate of diffusion ( sim 1 / ) molecular mass ( mathrm{MD} 2=4 ) ( mathrm{MH} 2=2 ) ( mathrm{RH} 2 / mathrm{RD} 2=(2)^{wedge}{1 / 2} ) As temp and volume (of the gases in the second container) remain constant ( mathrm{R} sim ) Pressure of gases ( (mathrm{P}) ) ( mathrm{P} sim ) no. of moles ( (mathrm{n})=>mathrm{R} sim mathrm{n} ) ( mathrm{nD} 2=mathrm{nH} 2 /(2)^{wedge} 1 / 2 ) Initial moles of ( mathrm{H} 2 ) in ( 1 mathrm{st} ) bulb ( =1.12 / 22.4=0.05 ) Final moles of ( mathrm{H} 2 ) in ( 1 mathrm{st} ) bulb ( =0.05 / 2 ) No. of moles of ( mathrm{H} 2 ) in ( 2 mathrm{nd} ) bulb ( =0.05 / 2=>mathrm{Wt} ) of ( mathrm{H} 2 ) ( =0.05 mathrm{g} ) ( mathrm{nD} 2=0.05 / 2^{*} 1.414=0.0176 ) ( Rightarrow mathrm{Wt} ) of ( mathrm{D} 2=4^{star} 0.0176=0.0707 mathrm{g} ) ( % ) of hydrogen ( =41.4 % )
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