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Chapter 9: Q5 E (page 506)
A typical barometric pressure in Denver, Colorado, is 615mm Hg. What is this pressure in atmospheres and kilopascals?
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Question: Calculate the relative rate of diffusion of \(^{\rm{1}}{{\rm{H}}_{\rm{2}}}\) (molar mass \({\rm{2}}{\rm{.0 g/mol}}\)) compared to that of \(^{\rm{2}}{{\rm{H}}_{\rm{2}}}\) (molar mass \({\rm{4}}{\rm{.0 g/mol}}\)) and the relative rate of diffusion of \({{\rm{O}}_{\rm{2}}}\) (molar mass \({\rm{32 g/mol}}\)) compared to that of \({{\rm{O}}_{\rm{3}}}\) (molar mass \({\rm{48 g/mol}}\)).
While resting, the average\({\rm{70 - kg}}\)human male consumes \(14\;{\rm{L}}\) of pure \({{\rm{O}}_2}\) per hour at \({25^\circ }{\rm{C}}\)and \({\rm{100 kPa}}\). How many moles of \({{\rm{O}}_2}\)are consumed by a \({\rm{70\;kg}}\)man while resting for \({\rm{1}}{\rm{.0\;h}}\)?
Question: Under which of the following sets of conditions does a real gas behave most like an ideal gas, and for which conditions is a real gas expected to deviate from ideal behaviour? Explain.
(a) high pressure, small volume
(b) high temperature, low pressure
(c) low temperature, high pressure
Question: When two cotton plugs, one moistened with ammonia and the other with hydrochloric acid, are simultaneously inserted into opposite ends of a glass tube that is 87.0 cm long, a white ring of \({\rm{N}}{{\rm{H}}_{\rm{4}}}{\rm{Cl}}\) forms where gaseous \({\rm{N}}{{\rm{H}}_{\rm{3}}}\) and gaseous \({\rm{HCl}}\) first come into contact. (Hint: Calculate the rates of diffusion for both \({\rm{N}}{{\rm{H}}_{\rm{3}}}\) and \({\rm{HCl}}\), and find out how much faster \({\rm{N}}{{\rm{H}}_{\rm{3}}}\) diffuses than \({\rm{HCl}}\).) \({\rm{N}}{{\rm{H}}_{\rm{3}}}{\rm{(g) + HCl(g)}} \to {\rm{N}}{{\rm{H}}_{\rm{4}}}{\rm{Cl(s)}}\)
At approximately what distance from the ammonia moistened plug does this occur?
Consider this scenario and answer the following questions: On a mid-August day in the north-eastern United States, the following information appeared in the local newspaper: atmospheric pressure at sea level 29.97 in. Hg,1013.9 mbar. (a) What was the pressure in kPa? (b) The pressure near the seacoast in the north-eastern United States is usually reported near 30.0 in. During a hurricane, the pressure may fall to near 28.0 in. Calculate the drop in pressure in torr.
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