Entropy Calculator calculates the entropy change for a chemical reaction.
List the given values for entropies in the problem.
Step 2 :
Calculate the unkown entropy by substituting the given values in the entropy formula.
$\Delta$SReaction = $\Delta$SProducts - $\Delta$SReactants
Step 3 :
Interpret whether the values of entropy is in specified units.
Calculate the entropy change for the following reaction.
PCl5 $\rightarrow$ PCl3 + Cl2Given that
$\Delta$SPCl3 + Cl2 = 122J/K/mole$\Delta$SPCl5 = 98J/K/mole
Step 1 :Given Data
$\Delta$SPCl3 + Cl2 = 122J/K/mole
$\Delta$SPCl5 = 98J/K/mole
Step 2 :$\Delta$SReaction = 122 - 98
$\Delta$SReaction = 24J/K/mole
Step 3 :The enthalpy change of the reaction is given in J/K/mole units.
Answer :The enthalpy change of the given reaction is 24J/K/mole.
Predict the entropy change wheteher it is positive or negative for the followig reaction.
2NOCl $\rightarrow$ 2NO + Cl2
Step 1 :The reactant side contains only 2 moles where the product side has 3 moles produced.
Step 2 :$\Delta$SReaction = $\Delta$SProducts - $\Delta$SReactants
$\Delta$SReaction = 3 - 2 = 1 J/K/mole
Step 3 :The entropy chenge in this reaction is given by 1 J/K/mole.
Answer :The change in entropy is positive in this reaction and it is given by 1 J/K/mole.