A student in a physics lab course has the task of measuring the pressure of a gas as a function of volume. Helium gas is placed in a cylinder that is fitted with a piston. By pushing the piston down, the student reduces the volume of the gas by a known amount and then measures the resulting gauge pressure (pressure relative to 1 atm). The measurements are made at room temperature (20°C). The resulting data are shown in the table.
Volume (L) | Gauge Pressure (atm) |
0.2 | 112 |
0.4 | 5.03 |
0.6 | 3.06 |
0.8 | 2.03 |
1.0 | 1.42 |
Make a linearized plot of the pressure-versus-volume data. Determine the number of moles of helium in the cylinder by using a “best fit” to the data.
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