1. After emptying her lung, a person inhales 4.1 L of air at 0.0 oC and holds her breath.
How much does the volume of the air increase as it warms up to her body temperature at 37 o ?
2. At what temperature is the rms speed of H2 equal to the rms speed that O2 has at 313K?
3.If the speed of molecules in an ideal gas is doubled, by what factor does the Kelvin
temperature change?
4. A balloon is filled with helium at a pressure of 2.4 x 10^5 Pa. The balloon is at a
temperature of 18 o C and has a radius of 0.25 m.
(a)How many helium atoms are contained in the balloon?
(b)Suppose we double the number of helium atoms in the
balloons, keeping the pressure and the temperature fixed. By what factor does the radius
of the balloon increase?

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