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Concept explainers
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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- 25arrow_forward2. Olympic cyclists fill their tires with helium to make them lighter. The mass of air used in the air filled tire is 8.56 g. Assume that the volume of the tire is 855 mL, that it is filled to a total pressure of 8.51 atm, and that the temperature is 25°C. a. Calculate the mass of helium in a helium-filled tire. (you must show all work to earn full credit). b. What is the difference between the two? c. Why is the helium-filled tire lighter?arrow_forwardAccording to the kinetic molecular theory, the particles of an ideal gas- A. Have no kinetic energy B.are arranged in a regular, repeated geometric pattern C. Have no potential energy D. Are separated by great distance compared to their sizearrow_forward
- III. Que 1. Suppose you wanted to perform this experiment using aluminum metal. As- suming a volume of hydrogen of 65 mL, a final gas temperature of 25°C, and of aluminum, in grams, to be reacted. (Hint: Use the information about the a gas pressure of approximately 720 torr, calculate the appropriate amount hydrogen gas and work backwards. Be sure to include a balanced chemical equation for the reaction of aluminum with HCl to produce hydrogen gas.) Show your work. answer: grams Al =arrow_forwardFind Sign is important! At Express your answer to two significant figures. Templates Symbols undo redo tes keyboard shortcuts Help mol - L-. 1 Atarrow_forward
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