For the following reactions, i
For the following reactions, indicate whether the entropy of thesystem increases, decreases, or remain nearly the same.
a) Al3+ (aq) + 3 OH- (aq) –> Al(OH)3 (s)
b) CaCO3 (s) –> CaO (s) + CO2 (g)
c) Mg (s) + Cu2+ (aq) –> Mg2+ (aq) + Cu (s)
d) 6 CO2 (g) + 6 H2O (g) –> C6H12O6 (s) + 6 O2
Answer:
Entropy : the measure of disorder of a system is calledentropy.It is a state property so we can measure change inentropy(dS).
a)
Al3+ (aq) + 3 OH- (aq) –> Al(OH)3 (s)
From above reaction the 1 mole of Al+3 and 3 molesOH-particles are free in aqueous solution so entropy is high but inprodut side it is converted to solid so disorderness become low,Hence Entropy decreases from reactant to products.
b)
CaCO3 (s) –> CaO (s) + CO2 (g)
From the above reaction the 1 mole of solid particlesare converted to 2 moles of gaseous particles so diordernessincreases so Entropy increases.
c)
Mg (s) + Cu2+ (aq) –> Mg2+ (aq) + Cu(s)
From above reaction both are the same charge ions soentropy remains constant
d)
6 CO2 (g) + 6 H2O (g) –> C6H12O6 (s) + 6 O2(g)
From the above reaction the 6 moles of CO2 gas and 6moles of H2O gas particles are converted into 1 mole of solidparticles so disorderness of the system decreases hence entropydecreases.
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