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Laboratory tests of a membrane for H2 /CH4 separation gave a permeate composition of 80 percent H, and a residue of 42 percent H, when the feed had 50 percent H2 and the feed and permeate absolute pressures were 100 and 151bf /in.2 . The permeate flow was 20 percent of the feed flow.
(a) What is the membrane selectivity?
(b) About what permeate composition would have been obtained if a vacuum had been used on the downstream side?
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While jogging on the beach (it's a warm summer day, about 30 deg C) a high-speed jet flies overhead. You guesstimate it's an altitude of about 3500 m, and count off about 5 s before you hear it. Estimate the speed and Mach number of the jet.
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