What is the molar mass of an unknown gas that has a mass of 68.780 g after a student used the Dumas method and the following: a 10 mL graduated cylinder to measure out 4.5 mL of unknown liquid added their unknown liquid to the 250 mL Erlenmeyer flask. When the liquid was completely evaporated, the student removed the Erlenmeyer flask from the water bath (which still wasn't boiling), quickly dried the flask and then weighed it. The weight of the flask was 69.092 g. Using a paper clip, the student poked 3 holes in the top of their aluminum foil The student then wrote down the pressure of the lab from the barometer (0.998 atm). The student then hastily wrote down that the water bath had a temperature of 100 °C and the volume of their Erlenmeyer to be 250 mL.
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.
What is the molar mass of an unknown gas that has a mass of 68.780 g after a student used the Dumas method and the following:
- a 10 mL graduated cylinder to measure out 4.5 mL of unknown liquid
- added their unknown liquid to the 250 mL Erlenmeyer flask.
- When the liquid was completely evaporated, the student removed the Erlenmeyer flask from the water bath (which still wasn't boiling), quickly dried the flask and then weighed it. The weight of the flask was 69.092 g.
- Using a paper clip, the student poked 3 holes in the top of their aluminum foil
- The student then wrote down the pressure of the lab from the barometer (0.998 atm).
- The student then hastily wrote down that the water bath had a temperature of 100 °C and the volume of their Erlenmeyer to be 250 mL.
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