Predict whether the entropy change of the system is positive of negative: for NH4Cl(s) --> NH3(g) + HCl(g)
Entropy change of system is shown by symbol S. When entropy increases S is positive, and when entropy decreases S is negative.
Balanced chemical equation can often be used to predict if
S is positive or negative.
There will be significant increase in entropy change of system if there is
- a change of state from solid or liquid to gas.
- increase in number of moles of substance between products and reactants.
Here S = positive ( i.e change from solid reactant to gaseous product; increase in number of molecules , both will increase disorder)
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