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Question:
Solution X boils at 100.26°C and solution Y boils at 101.04°C. Both solutions are at atmospheric pressure and contain the same solute concentration. Which of the following conclusions can be drawn?
A. The freezing point of solution X is lower than that of solution Y.
B. The vapor pressure of solution X is higher than that of solution Y at 100.26°C.
C. Solution X and solution Y are immiscible.
D. The vapor pressure of solution X is lower than that of solution Y at 100.26°C
Answer is B.
The reasoning is because: "... A solution boils when its vapor pressure is equal to the atmospheric pressure, solution Y must have had a lower vapor pressure to begin with. Choice B is therefore correct, and choice D incorrect...."
I thought that since X boils at a lower temperature, it has a lower vapor pressure than Y. Why is it stating what it had to begin with and not now with the solute?! Thanks in advance!
Solution X boils at 100.26°C and solution Y boils at 101.04°C. Both solutions are at atmospheric pressure and contain the same solute concentration. Which of the following conclusions can be drawn?
A. The freezing point of solution X is lower than that of solution Y.
B. The vapor pressure of solution X is higher than that of solution Y at 100.26°C.
C. Solution X and solution Y are immiscible.
D. The vapor pressure of solution X is lower than that of solution Y at 100.26°C
Answer is B.
The reasoning is because: "... A solution boils when its vapor pressure is equal to the atmospheric pressure, solution Y must have had a lower vapor pressure to begin with. Choice B is therefore correct, and choice D incorrect...."
I thought that since X boils at a lower temperature, it has a lower vapor pressure than Y. Why is it stating what it had to begin with and not now with the solute?! Thanks in advance!