3. Heat exchange between water and a reaction: Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the equation, CO2(s)→ CO2(g) Last night when I was out clubbing, I went back stage to see how their fog machine worked. It turns out that the entire fog machine was comprised of 10.0 L of water at 85.0°C, some dry ice, a fan and some tubing. When dry ice is put into the hot water, the dry ice sublimes to CO₂(g). The CO₂(g) and some H₂O(g) form fog that then gets blown by the fan through the tubing. Assuming no heat loss to the surroundings (and that all of the heat lost by the water cooling goes to sublime the dry ice), I immediately calculated the grams of dry ice that were needed to exactly cool the water from 85.0°C to 10.0°C. I needed to recall that AH f for CO₂(s) is -427.4kJ/mol (I always go out with Tro, but even the text didn't have this piece of info). A. What is AH°rxn for the sublimation of CO₂? To calculate this, use the AHf values for the sublimation reaction. B. How many grams of CO₂(s) did I calculate? C. How many L of CO₂ gas at 1 atm and 22°C would be created?
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.
need help
Trending now
This is a popular solution!
Step by step
Solved in 4 steps
