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Which reaction would cause an increase in entropy? A. SO2Cl2(g) SO2(g) + Cl2(g) B. PCl3(g) + Cl2(g) PCl5(g) C. 2CO(g) + O2(g) 2CO2(g) D. C2H2(g) + H2(g) C2H4(g)

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A. SO2Cl2(g) --> SO2(g) + Cl2(g) 
1 mole of SOCl2 becomes 1 mole SO2 and 1 mole Cl2 
1 mole --> 2 moles 
entropy increases 

Answer: A) [tex]SO_2Cl_2(g)\rightarrow SO_2(g)+Cl_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.

A) [tex]SO_2Cl_2(g)\rightarrow SO_2(g)+Cl_2(g)[/tex]

1 mole of gaseous reactant is converting to 2 gaseous products, thus the entropy increases.

B) [tex]PCl_3(g)+Cl_2(g)\rightarrow PCl_5(g)[/tex]

2 moles of gaseous reactants are converting to 1 gaseous products, thus the entropy decreases.

C) [tex]2CO(g)+O_2(g)\rightarrow 2CO_2(g)[/tex]

3 moles of gaseous reactants are converting to 1 gaseous product, thus the entropy decreases.

D. [tex]C_2H_2(g)+H_2(g)\rightarrow C_2H_4(g)[/tex]

2 moles of gaseous reactants are converting to 1 gaseous product, thus the entropy decreases.

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