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.
21. According to Figure 2, which of the following graphs best shows the BPs of acetaldehyde, acetone, and pentane at 850 torr?
Your Answer is
Correct Answer is A
Explanation
Look at figure 2, when the abscissa pressure is 850 torr, the ordinate BP of acetone is the largest, while the ordinate BP of acetate is the smallest, so option A is correct