You are in a labratory conducting an experiment using an unknown compound containing carbon, hydrogen, and oxygen. You take 7.26 grams of the unknown compound and burn it completely in oxygen gas. You measure that 2.7 grams of liquid water are formed and collect 12.5 liters of carbon dioxide gas over water, much like the experiment that you did for the R-Lab. The temperature when you were collecting the gas was 26 degrees Celsius and the barometric pressure was 652 mmHg. You were able to adjust the eudiometer so the height above the water was 0 (h=0). The vapor pressure of water at this temperature is 25.209 mmHg. a. Determine the empirical formula of the unknown compound. b. In a different experiment, 10.47 grams of the gaseous sample of the unknown gaseous compound was found to occupy 2.61 L at 425 C and 722 mmHg. Determine the molecular formula for the unknown compound.
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.
You are in a labratory conducting an experiment using an unknown compound containing carbon, hydrogen, and oxygen. You take 7.26 grams of the unknown compound and burn it completely in oxygen gas. You measure that 2.7 grams of liquid water are formed and collect 12.5 liters of carbon dioxide gas over water, much like the experiment that you did for the R-Lab. The temperature when you were collecting the gas was 26 degrees Celsius and the barometric pressure was 652 mmHg. You were able to adjust the eudiometer so the height above the water was 0 (h=0). The vapor pressure of water at this temperature is 25.209 mmHg.
a. Determine the empirical formula of the unknown compound.
b. In a different experiment, 10.47 grams of the gaseous sample of the unknown gaseous compound was found to occupy 2.61 L at 425 C and 722 mmHg. Determine the molecular formula for the unknown compound.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
