A student is taking General Chemistry Lab this semester. In a experiment, instead of reacting Mg with HCl, he is supposed to react zinc (Zn) with HCl and perform a similar experiment. He reacted a 0.063g sample of zinc with excess 1 M HCl at 24 degrees Celsius (both lab and water temperature). The reaction produced a gas that expanded to a volume of 25.0 mL. The atmospheric pressure was 760 mmHg on the day he performed the experiment. a. Write the balanced equation for this reaction. b. What is the pressure (in atm) of the H2 gas that was produced? Remember to take into account the vapor pressure of water. c. What is the temperature in Kelvin? d. How many moles of H2 should you produce with this amount of starting material? e. Using the P, V, T, and n listed above, solve for your experimentally determined value of the Ideal Gas Constant, R.
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.
. A student is taking General Chemistry Lab this semester. In a experiment, instead of reacting Mg with HCl, he is supposed to react zinc (Zn) with HCl and perform a similar experiment. He reacted a 0.063g sample of zinc with excess 1 M HCl at 24 degrees Celsius (both lab and water temperature). The reaction produced a gas that expanded to a volume of 25.0 mL. The atmospheric pressure was 760 mmHg on the day he performed the experiment.
a. Write the balanced equation for this reaction.
b. What is the pressure (in atm) of the H2 gas that was produced? Remember to take into account the vapor pressure of water.
c. What is the temperature in Kelvin?
d. How many moles of H2 should you produce with this amount of starting material?
e. Using the P, V, T, and n listed above, solve for your experimentally determined value of the Ideal Gas Constant, R.
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