(kJ/mol) (kJ/mol) Li2O(s) -597.9 Li+(aq) -278.5 Na2O(s) -416 Na+(aq) -240 K2O(s) -361 K+(aq) -251 CO(g) -110.5 CO2(g) -393.5 H2O(l) -286 OH-(aq) -230 CCl4(l) -135 SiO2(s) -911 LiCl(s) -409 NaCl(s) -411 KCl(s) -436 Cl-(aq) -167 Calculate ΔH° for the following reactions: 1a) 4 Li(s) + O2(g) --> 2 Li2O(s) 1b) 2Li(s) + CO2(g) ----> Li2O(s) + CO(g) 1c) 2Li(s) + 2H2O(l) ---> 2LiOH(aq) + H2(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.
hello, i need help with part a, b, and c.
In the chemistry lab, one often has to work with very reactive metals such as sodium and lithium. Unfortunately, these same metals can react vigorously with water or oxygen and cause fires. Given the following information:
| (kJ/mol) | (kJ/mol) | ||
| Li2O(s) | -597.9 | Li+(aq) | -278.5 |
| Na2O(s) | -416 | Na+(aq) | -240 |
| K2O(s) | -361 | K+(aq) | -251 |
| CO(g) | -110.5 | CO2(g) | -393.5 |
| H2O(l) | -286 | OH-(aq) | -230 |
| CCl4(l) | -135 | SiO2(s) | -911 |
| LiCl(s) | -409 | NaCl(s) | -411 |
| KCl(s) | -436 | Cl-(aq) | -167 |
Calculate ΔH° for the following reactions:
1a)
| 4 Li(s) + O2(g) --> 2 Li2O(s) |
1b)
| 2Li(s) + CO2(g) ----> Li2O(s) + CO(g) |
1c)
| 2Li(s) + 2H2O(l) ---> 2LiOH(aq) + H2(g) |
Step by step
Solved in 4 steps
