Achieve Weeks 3 & 4 Question 7

[Emily Engelkemier 1E]

Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this list of thermodynamic properties.
C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g)

How do you find deltaHrxn for this question?

[Cadence Chang]

Hi there!

∆Hrxn = ∑n*∆Hf(products) – ∑n*∆Hf(reactants). Use the list to find the enthalpies of formation. Hope this helps!

[Grace Chen 3F]

Delta H rxn = Sum of enthalpy of formation of product - sum of enthalpy of formation of reactant

Delta H rxn = 3* delta Hf (CO2) + 4* delta Hf (H2O) - delta Hf (C3H8) - 0

[Kurosh Zamiri 1I]

To find the deltaHrxn for this equation, we use the delta H formation of products - delta H formation of reactants. These values can be found in the table given, while also keeping in mind the coefficients of the balanced equation that should be taken into account when calculating the enthalpy.