Scan_Doc0093 - 5.2 The Gas Laws of Boyle, Charles, and...

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22.45 Ideal Ne '? ~ -__ -__ --J_] 22.40 ~- - - - - 02 ~ 22.35 ~02 :;,. Q., 22.30 22.25 o 0.25 0.50 0.75 1.00 P (atm) EXAMPLE 5.2 Boyle's law also can be written as P, V, = P 2 V 2 5.6 x 10 3 Pa 1.5 X 10 4 Pa V= 1.53 L V=? As pressure increases, the volume of 80 2 decreases. 5.2 The Gas Laws of Boyle, Charles, and Avogadro 185 Figure 5.6 A plot of PV versus P for several gases at pressures below 1 atm. An ideal gas is expected to have a constant value of PV, as shown by the dotted line. Carbon dioxide shows the largest change in PV, and this change is actually quite small: PV changes from about 22.39 L . atm at 0.25 atm to 22.26 L . atm at 1.00 atm. Thus Boyle's law is a good approximation at these relatively low pressures. Results for several gases at pressures below 1 atm. are shown in Fig. 5.6. Note the very small changes that occur in the product PV as the pressure is changed at these low pres- sures. Such changes become more significant at much higher pressures, where the com- plex nature of the dependence
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