178k views
1 vote
Methanogenic bacteria convert acetic acid (CH3COOH) to CO2(g) and CH4(g)

Methanogenic bacteria convert acetic acid (CH3COOH) to CO2(g) and CH4(g)-example-1

1 Answer

3 votes

Answer

ΔHºrxn= 16.2 kJ

Procedure

The first step is to balance the equation. However, it is already balanced.

CH₃COOH → CH₄ + CO₂

For a chemical reaction, the enthalpy of reaction (ΔHrxn) is the difference in enthalpy between products and reactants

We will use the standard enthalpy of formation to calculate the standard enthalpy of reaction:


\Delta H\degree_(rxn)=\Sigma vp\Delta H\degree_f\text{ -}\Sigma vr\Delta H\degree_f

where

vp= stoichiometric coefficient of the product from the balanced reaction

vr= stoichiometric coefficient of the reactants from the balanced reaction

ΔHºf= standard enthalpy of formation for the reactants or the product

For this problem we will have the following:


\Delta H\degree_(rxn)=\Sigma(1\text{ mol}*-393.5\text{ KJ/mol}+1\text{ mol}*-74.8\text{ KJ/mol\rparen}-\Sigma(1\text{ mol}*-484.5\text{ KJ/mol\rparen}

Solving we have

ΔHºrxn= 16.2 kJ

User Skunkfrukt
by
3.1k points