Please help, I am having trouble solving these problems at nonstandard temperatures.
Methanol burns in oxygen to form carbon dioxide and water.
Using the balanced reaction,
2CH3OH(l) + 3OH2(g) --> 2CO2(g) + 4H2O(g)
1) Calculate delta H(rxn) in kJ at 24 degrees Celsius
2) Calculate delta S(rxn) in J/K at 24 degrees Celsius
Thanks in advance!
To solve these problems, you will need to use thermodynamic principles and equations. Here is how you can calculate delta H(rxn) and delta S(rxn) at 24 degrees Celsius:
1) Calculate delta H(rxn) in kJ at 24 degrees Celsius:
Delta H(rxn) represents the change in enthalpy of the reaction. You can calculate it using the following formula:
ΔH(rxn) = Σ[H(products)] - Σ[H(reactants)]
- First, you need to determine the enthalpy of the products and reactants in the balanced equation. You can find these values in thermodynamic tables or use the average bond enthalpies method.
- Then, calculate Σ[H(products)] by multiplying the stoichiometric coefficient of each product by its enthalpy value and summing them up.
- Next, calculate Σ[H(reactants)] in the same way, multiplying the stoichiometric coefficient of each reactant by its enthalpy value and summing them up.
- Finally, subtract Σ[H(reactants)] from Σ[H(products)] to get ΔH(rxn) in kJ.
2) Calculate delta S(rxn) in J/K at 24 degrees Celsius:
Delta S(rxn) represents the change in entropy of the reaction. You can calculate it using the following formula:
ΔS(rxn) = Σ[S(products)] - Σ[S(reactants)]
- First, determine the entropy of the products and reactants. You can find these values in thermodynamic tables.
- Calculate Σ[S(products)] by multiplying the stoichiometric coefficient of each product by its entropy value and summing them up.
- Likewise, calculate Σ[S(reactants)] in the same way, multiplying the stoichiometric coefficient of each reactant by its entropy value and summing them up.
- Subtract Σ[S(reactants)] from Σ[S(products)] to obtain ΔS(rxn) in J/K.
Finally, it is important to note that the enthalpy and entropy values in the equations should correspond to the given temperature of 24 degrees Celsius.