Passage IV
Atmospheres (atm), torr, and kilopascals (kPa) are common units of pressure. Figure 1 can be used to convert between torr and kPa. A pressure of 1 atm is indicated in Figure 1.
Figure 2 shows how boiling point (BP) varies with atmospheric pressure for 3 compounds: acetaldehyde, acetone, and pentane. The unit of pressure is torr.
Figure 3 shows how BP varies with atmospheric pressure for 3 other compounds: ethanol, methanol, and methyl acetate. The unit of pressure is kPa.
24. A compound’s standard boiling point is the temperature at which the compound boils when the atmospheric pressure is 1 atm. Based on Figures 1 and 2, the standard boiling point of pentane is approximately:
Your Answer is
Correct Answer is G
Explanation
It can be seen from figure 1 that 1 atm is about 760 torr;
Looking at figure 2, when the abscissa is 760, the ordinate of pentane is about 36°C