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.
22. According to Figure 3, at 110 kPa, the BP of methyl acetate is approximately how much lower than or higher than the BP of ethanol?
Your Answer is
Correct Answer is F
Explanation
See figure 3, when the abscissa pressure is 110 kPa, the BP of methyl acetate is about 81°C, the BP of ethanol is about 59°C, and the BP of methyl acetate is about 20°C lower than that of ethanol