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Nata [24]
3 years ago
9

Of the following reactions occurring at 25ºC, which one involves the greatest increase in entropy?H2(g) + Cl2(g) = 2 HCl(g)H2O(s

) = H2O(l)Pb2+(aq) + 2 Cl-(aq) = PbCl2(s)CO2(s) = CO2(g)
Chemistry
1 answer:
SVETLANKA909090 [29]3 years ago
3 0

Answer: [tex]CO_2(s)\rightarrow CO_2(g)[/tex]

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

\Delta S is positive when randomness increases and \Delta S is negative when randomness decreases.

a) H_2(g)+Cl_2(g)\rightarrow 2HCl(g)

2 molesof gas are converting to 2 moles of another gas , thus \Delta S is zero.

b) H_2O(s)\rightarrow H_2O(l)

1 mole of solid is converting to 1 mole of liquid, the randomness increases and thus \Delta S is positive.

b) Pb^{2+}(aq)+2Cl^-(aq)\rightarrow PbCl_2(s)

2 moles of ions are converting to 1 mole of solid, the randomness decreases and thus \Delta S is negative

d) CO_2(s)\rightarrow CO_2(g)

1 mole of solid is converting to 1 mole of gas, the randomness increases drastically and thus \Delta S is highly positive.

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