A constant-volume gas thermometer reads 6.66 kPa at the triple point of water.What is the pressure reading at the normal boiling point of water?
A)2.44 kPa
B)18.2 kPa
C)9.10 kPa
D)11.8 kPa
E)4.87 kPa

Question

Quizplus · Accepted Answer

Since it is a constant-volume gas thermometer, the pressure reading at the triple point of water is equal to the pressure of the gas at the normal boiling point of water. Using a table of pressure-temperature data for water, we see that the triple point of water corresponds to a temperature of 273.16 K and a pressure of 6.116 kPa. Therefore, we can use the ideal gas law to find the pressure at the normal boiling point of water:
P1/T1 = P2/T2
6.116 kPa / 273.16 K = P2 / 373.15 K
P2 = (6.116 kPa / 273.16 K) x 373.15 K = 8.315 kPa
Therefore, the pressure reading at the normal boiling point of water is approximately 8.3 kPa, which is closest to choice C (9.10 kPa).

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