Poiseuille’s equation for the flow of a gas through a tube is different from that of an…

Poiseuille’s equation for the flow of a gas
through a tube is different from that of an incompressible liquid. If the gas
is assumed to be ideal, the equation for the molar rate of flow is10

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where we now use r for the radius of the tube and R for the ideal gas constant,
and where n is the number of moles of the gas that has passed through the tube.
Find the time required for 0.100 mol of carbon dioxide to flow through a tube
of length 40.0 cm and diameter 0.850 mm at 20.0◦C.