The unknown compound (molecular formula from #1) reacts with oxygen in a combustion reaction to form water and carbon dioxide. a. Write a balanced equation for this reaction. b. If 20.2 grams of the unknown compound reacts with 25. mL of oxygen at 760 torr and 273.15 K, then which reactant is limiting? c. Calculate the theoretical yield of carbon dioxide in this reaction in grams. d. All combustion reactions are redox reactions. Label which element was oxidized and which element was reduced as well as the agents (which reactant was the reducing agent and which reactant was the oxidizing agent) in this reaction. e. Given the following standard molar enthalpies of formation for the reactants and products, calculate the DH°reaction in kJ/mol. Reactants and Products in the Reaction DH°f (in kJ/mol) C2H4O2 (l) -484.1 O2 (g) 0 CO2 (g) -393.5 H2O (l) -285.8 f. How much energy is released when 20.2 grams of C2H4O2 is reacted?
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.
The unknown compound (molecular formula from #1) reacts with oxygen in a combustion reaction
to form water and carbon dioxide.
a. Write a balanced equation for this reaction.
b. If 20.2 grams of the unknown compound reacts with 25. mL of oxygen at 760 torr and 273.15
K, then which reactant is limiting?
c. Calculate the theoretical yield of carbon dioxide in this reaction in grams.
d. All combustion
element was reduced as well as the agents (which reactant was the reducing agent and which
reactant was the oxidizing agent) in this reaction.
e. Given the following standard molar enthalpies of formation for the reactants and products,
calculate the DH°reaction in kJ/mol.
Reactants and Products in the Reaction DH°f (in kJ/mol)
C2H4O2 (l) -484.1
O2 (g) 0
CO2 (g) -393.5
H2O (l) -285.8
f. How much energy is released when 20.2 grams of C2H4O2 is reacted?
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