For a given sample of CH3OH, the enthalpy change during the reaction is 82.6 kJ. What mass of methane gas produced? Express the mass to three significant digits with the appropriate units.
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.
![### Chemical Reaction and Enthalpy Change
**Consider the following reaction:**
\[ 2 \text{CH}_3\text{OH}_{(g)} \rightarrow 2 \text{CH}_4_{(g)} + \text{O}_2_{(g)} \]
**Enthalpy change, \(\Delta H = +252.8 \, \text{kJ}\)**
#### Explanation:
- This chemical equation shows the conversion of methanol gas (\(\text{CH}_3\text{OH}_{(g)}\)) into methane gas (\(\text{CH}_4_{(g)}\)) and oxygen gas (\(\text{O}_2_{(g)}\)).
- The \( \Delta H \) value indicates that the reaction is endothermic, requiring \( 252.8 \, \text{kJ} \) of energy to proceed.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9b0e7686-0c0d-4eba-ac81-54e736b47f2f%2F330555dd-460f-4b06-afc2-a48293a55e37%2Futfy2o_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 4 steps
