1) To experimentally validate the saturation vapor pressure of carbon dioxide, y
ID: 115706 • Letter: 1
Question
1) To experimentally validate the saturation vapor pressure of carbon dioxide, you have built four boxes, each of a difference size (with square tops of side length D). These boxes are sealed by a platform on top, which can be held down using different weights to change the pressure inside. Inside each box you place a block of dry ice, the solid phase of CO2. Your textbook tells you that at room temperature, the equilibrium vapor pressure of CO2 is 6 MPa. To test the accuracy of your textbook, you have balanced an animal of known mass on the top platform of each box and pumped out the gas around the dry ice. The ice starts to sublimate, and as more and more mass enters the gas phase, the pressure inside the box rises. Given the following box sizes and animal weights, which animals will be able to sit comfortably as their box stays sealed, and which animals will be forced off their pedestal as the seal is overcome (show your work): a) Animal and Mass (kg) Mouse 0.015 kg Dog - 10 kg Human 70 kg Elephant - 3000 kg Blue Whale - 12000 kg Box Size (D) 0.1 m b) Using the plot of equilibrium vapor pressure below, determine the temperatures at which the vapor pressure is in equilibrium with the weighted lid for the given box size. What sized box top is needed for each animal to perfectly balance the internal pressure with the animals' weights at room temperature? c)Explanation / Answer
ANSWER:
If the liquid is in an open container and exposed to normal atmospheric pressure, the liquid boils when itssaturated vapour pressure becomes equal to 1 atmosphere (or 101325 Pa or 101.325 kPa or 760 mmHg). This happens with water when the temperature reaches 100°C.
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