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P.182OP2-CBSE CH-SM&GS 4215. (a) Two fnasks of equal volume connected by a narrow tube (of negligible volume) are at27 C and contain 0.7 moles of H2 at 0.5 atm. One of the flask is then immersed into abath kept at 127"C, while the other remains at 27*C. Calculate the final pressure and thenumber of moles of H2 is each flask.(b) 1 gm of an alloy of Al and Mg reacts with excess HCI to form AICls. MgCh2 and H2. Theevolved H; collected over mercury at O°C occupied 1200 ml at 699 mm Hg. What is thecomposition of alloy? |
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Answer» a)PV=nRT 0.5v=0.7R300 so v=420R In 2nd case the pressure will be same in both flasks and sum of moles of gas will be 0.7 Flask 1- PV=aRT P420R=aR300 a=1.4P Flask2- PV=bRT P420R=bR400 b=1.05P a + b = 2.45P = 0.7 P = 0.28 a= 0.294, b= 0.392 |
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