20. Which choice best indicates the degree of correctness of this statement? \"A
ID: 1018638 • Letter: 2
Question
20. Which choice best indicates the degree of correctness of this statement? "At standard pressure the boiling point of normal propanol is higher than the boiling point of water." Vapor Pressure of Substances in mmHg Temperature 0°C n-propanol3.4 14.5 87.2 376 697 836 water 4.6 17.6 92.0 354.9 2.1 | 4.4 | 17.0 | 61.3 760 131.1 (A) (B) (C) (D) (E) The statement is true. The statement is probably true; additional data would be needed for a final decision. It is impossible to judge the statement because the data are insufficient. The statement is probably false; additional data would be needed for a final decision. The statement is false.
Explanation / Answer
20. (E) The statement is false -------------- correct answer
From table the vapor pressure of n-propanol at 100oC is 836 mmHg wheras for water it is 760 mmHg. If boiling point is higher for any substance it will not give vapor easily until the temperature exceeds its boiling point. For water the boiling point is 100oC this means vapors starts only after the temperature is 100oC. From table it is clear that the vapor pressure of n-propanol at 100oC is 836 mmHg this value is higher than 760 mmHg for water means n-propanol has lower boiling point than water thatswhy it is given more vapor pressure.(Started giving vapor early than water).
21. (B) decreasing the temperature decreases the vapor pressure of ice ------- correct answer
Reason is same as above.
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