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Problem :
Molly admires her red balloon, which has a volume of 2.0 liters at sea level
(1.0 atm). A clown catches her eye, and she lets go of the balloon. The red
balloon goes up and up until the pressure around it is 0.80 atm. Assuming
isothermal conditions, what is the new volume of Molly's red balloon?

This problem is a straightforward application of Boyle's law.
P_{1}V_{1} = P_{2}V_{2} rearranges to = V_{2}. After plugging in values,
we find that the balloon's volume V_{2} = 2.5 liters.

Problem :
Graph the pressure vs. volume relationship dictated by Boyle's law. If Boyle's
law stated that P = aV, where a < 0, what would the graph of P vs. V
look like?

A graph of P vs. V according to Boyle's law is shown below:
When P = aV, the graph of P vs. V will look like this:
Note that P = aV cannot be true. The equation predicts negative volumes as
P increases.

Problem :
Initially the volume and pressure of a sample of gas are 1 dm^{3} and 10 smoots,
respectively. The volume is raised isothermally to 10 dm^{3}. What is the
pressure of the gas in smoots under these conditions?

Don't let the unfamiliar units of dm^{3} and smoots confuse you. Your first
reaction may to be convert to SI units. In this case you can't; smoots are
completely imaginary. Instead realize that the equation P_{1}V_{1} = P_{2}V_{2}
works as long as the units of P_{1}P_{2} and V_{1}V_{2} are the same. The actual
units of pressure or volume don't matter. So rearrange the equation to
= P_{2}. Plugging in values, we find that P_{2} = 1 smoot.

Problem :
One end of a mercury filled manometer is open to the atmosphere, while the
other is closed and contains a vacuum. What does the height difference h of
the Hg columns measure?

h measures the difference in pressure between the two ends of the manometer.
Since the pressures at the two ends are 0 and P_{atm}, the height h
will measure the atmospheric pressure.

Problem :
The pressure of gas A (P_{A}) is 3.0 atm. The height of the mercury column h
is 1140 mm. What is the pressure of gas B (P_{B}) in atmospheres? Assume that
1 mm Hg = 1/760 atm.

From the diagram we can see that P_{A} must be greater than P_{B} by 1140 mm of
Hg. 1140 mm Hg converts to 1.5 atm, so P_{B} = 3.0 - 1.5 = 1.5 atm.