Aluminum reacts with oxygen gas at 343 K according to the following balanced equation: 4 AI (s) + 3 02 (g) ---> 2 Al203 (s) A sample of Al is placed in sealed 2.50 L glass flask containing pure O2 gas at a pressure of 1.73 atm. One hour later, all the Al has reacted and the O2 gas pressure has dropped to 1.19 atm. Calculate the original mass of Al placed in the flask. Assume that the temperature regains constant, and that the solids Al and Al203 occupy negligible volume. Options: A. 1.29 g B. 1.72 g C. 3.80 g D. 5.53 g
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
5.
Aluminum reacts with oxygen gas at 343 K according to the following balanced equation:
4 AI (s) + 3 02 (g) ---> 2 Al203 (s)
A sample of Al is placed in sealed 2.50 L glass flask containing pure O2 gas at a pressure of 1.73 atm. One hour later, all the Al has reacted and the O2 gas pressure has dropped to 1.19 atm. Calculate the original mass of Al placed in the flask. Assume that the temperature regains constant, and that the solids Al and Al203 occupy negligible volume.
Options:
A. 1.29 g
B. 1.72 g
C. 3.80 g
D. 5.53 g
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
