Illinois Central College CHEMISTRY 130 Laboratory Section: Name: Exercise 8 SHOW YOUR WORK PRELAB: Exp.8 Molecular Mass of a Condensable Vapor 1. One liter of an unknown gas weighs 1.55 grams at STP. What is the molecular mass of the gas? Page 5 2. The pressure in an automobile tire is 42 psi when the tire temperature is 100°C. What will be the pressure in the tire when the tire cools to 22°C? b. What is the molecular mass of the gas? 3. The molecular mass of propane is 44 g/mol. What is the mass of one liter of propane at God ootatic STP? 5. What would be the volume of 10.0 grams of oxygen gas at STP? 4. A liter of gas at a temperature of 25°C and a pressure of 730 mm weighs 1.6 grams. a. What volume will the gas occupy at STP? ALD 6. At STP a 5.0 mL sample of gas weighs 0.024 g. What is the molecular mass of the gas? 46
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
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