객관식
Consider the phase diagram for carbon dioxide. At 1 atm pressure and room temperature (25 ^\(\circ\) C), what is the physical state of CO_2?
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객관식
What is the normal freezing point of this unknown substance?
A
0 °C
B
–200 °C
C
200 °C
D
400 °C
E
100 °C
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검증된 단계별 안내1
Identify the axes of the phase diagram: the x-axis represents temperature (in °C) and the y-axis represents pressure (in atm).
Locate the line that separates the solid and liquid phases on the graph. The point where this line intersects the pressure of 1 atm (normal atmospheric pressure) corresponds to the normal freezing point.
Find the temperature value on the x-axis at the intersection of the solid-liquid boundary line with the horizontal line at 1 atm pressure.
This temperature is the normal freezing point of the substance because it is the temperature at which the substance changes from liquid to solid at 1 atm pressure.
From the graph, observe that the solid-liquid boundary line crosses the 1 atm pressure line at approximately 100 °C, indicating the normal freezing point.
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