Name Absolute Zero Determination Prelab Questions 1 What app

Name: Absolute Zero Determination Pre-lab Questions 1. What approximations are made in the ideal gas law? In other words, how do ideall gases differ from real gases? How does the information you gave in answering Question 1 affect using Charles\' Law to predict absolute zero? 3. Why do we need to adjust the calculations to determine the amount of \"dry\" air in the graduated cylinder? Why is it not advisable to hold the graduated cylinder under the surface of the water using your hand during the course of this experiment? On a humid day in summer, the mole fraction of gaseous H,0 (water vapor) in the air at 25 \"C can be as high as 0.0287. Assuming a total pressure of 0.977 atm, what is the partial pressure (in atm) of the dry air? 5.

Solution

1)Temperature is high
Pressure is low
Monatomic gas and compressibility factor is pv/nrt

If the compressibility equals one, then the gas is behaving exactly like an ideal gas. if it is more than 1 then ideal gas deviates from real gas and As T increases, intermolecular attractions become less relevant.As P decreases, molecular size matters less as the average distance between adjacent molecules becomes larger, making larger molecular sizes irrelevant.Monatomic gases also means that intermolecular attractions will be weaker. Monatomic gases do not have ions, so there are no ion-dipole or ion-induced dipole intermolecular forces. Hydrogen bonding forces will also not occur. Nor will dipole-dipole or dipole-induced dipole forces.

2)Charles\' Law predicts the idea of absolute zero. As   VT so for a fixed mass of gas at constant pressure, the volume is proportional to the tenperature. It implies that zero volume corresponds to the idea that the gas molecules are not exerting a force. In other words, at absolute zero -- the gas molecules only exhibit internal vibrations and rotations.

4) A graduated cylinder is a common piece of laboratory equipment used to measure the volume of a liquid.To read the volume accurately, the observation must be at an eye level and read at the bottom of a meniscus of the liquid level.if it is hold under the surface of water the the meniscus of water cant be seen from eyes . so it is difficult to measure the volume of liquid under water surface.