91Ó°ÊÓ

The pressure of air in a reasonably good vacuum might be \(2.0 \times\) \(10^{-5} \mathrm{mmHg}\). What mass of air exists in a \(250 \mathrm{~mL}\) volume at this pressure and \(25^{\circ} \mathrm{C}\) ? Take \(M=28 \mathrm{~kg} / \mathrm{kmol}\) for air.

What volume will \(1.216\) g of \(\mathrm{SO}_{2}\) gas \((M=64.1 \mathrm{~kg} / \mathrm{kmol})\) occupy at \(18.0^{\circ} \mathrm{C}\) and \(755 \mathrm{mmHg}\) if it acts like an ideal gas?

Compute the density of \(\mathrm{H}_{2} \mathrm{~S}\) gas \((M=34.1 \mathrm{~kg} / \mathrm{kmol})\) at \(27^{\circ} \mathrm{C}\) and \(2.00\) atm, assuming it to be ideal.

A 30-mL tube contains \(0.25 \mathrm{~g}\) of water vapor \((M=18 \mathrm{~kg} / \mathrm{kmol})\) at a temperature of \(340^{\circ} \mathrm{C}\). Assuming the gas to be ideal, what is its pressure?

A 500-mL sealed flask contains nitrogen at a pressure of \(76.00\) cmHg. A tiny glass tube lies at the bottom of the flask. Its volume is \(0.50 \mathrm{~mL}\) and it contains hydrogen gas at a pressure of \(4.5\) atm. Suppose the glass tube is now broken so that the hydrogen fills the flask. What is the new pressure in the flask?

A cylindrical diving bell (a vertical cylinder with open bottom end and closed top end) \(12.0 \mathrm{~m}\) high is lowered in a lake until water within the bell rises \(8.0 \mathrm{~m}\) from the bottom end. Determine the distance from the top of the bell to the surface of the lake. (Atmospheric pressure \(=1.00\) atm. )