Given the thermochemical equation
4AlCl₃(s) + 3O₂(g) ? 2Al₂O₃(s) + 6Cl₂(g) ; ?_rH
= -529 kJ/mol-rxn
Find ?_rH
For the following reaction.
$\frac { 1 } { 3 }$ Al₂O₃(s) + Cl₂(g) ? $\frac{2}{3}$ AlCl₃(s) + $\frac { 1 } { 2 }$ O₂(g)

Question

Given the thermochemical equation
4AlCl₃(s) + 3O₂(g) ? 2Al₂O₃(s) + 6Cl₂(g) ; ?_rH
= -529 kJ/mol-rxn
Find ?_rH
For the following reaction.

\frac { 1 } { 3 }

Al₂O₃(s) + Cl₂(g) ?

\frac{2}{3}

AlCl₃(s) +

\frac { 1 } { 2 }

O₂(g)

Quizplus · Accepted Answer

The given reaction is the reverse of the original reaction and scaled by a factor of 1/6. Therefore, the enthalpy change is positive and scaled by 1/6 of 529 kJ/mol-rxn, which is 88.2 kJ/mol-rxn.

Given the Thermochemical Equation 4AlCl3(s) + 3O2(g) ? 2Al2O3(s) 13\frac { 1 } { 3 }31​

Given the Thermochemical Equation
4AlCl₃(s) + 3O₂(g) ? 2Al₂O₃(s) $\frac { 1 } { 3 }$