The following enthalpy and entropy changes are known for the reactions shown at 298 K. Reaction Cu(s) +...

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Chemistry

The following enthalpy and entropy changes are known for thereactions shown at 298 K.
Reaction Cu(s) + 2H⁺(aq) <=> Cu²⁺(aq) +H2(g) Zn(s) + 2H⁺(aq) <=> Zn²⁺(aq) +H2(g)
delta H 65 kJ/mol -153 kJ/mol
delta S -2.1 J/mol K -23.1 J/mol K
Part a
Which of the these two metals, Zn or Cu, should dissolve in 1 Macid solution? Explain your answer.
Part B -
Calculate E^o for the Zn reaction. Show work tosupport your answer.
Part C -
Which of the two reactions has an equilibrium constant thatincreases with temperature? Explain your answer.
Part D -
Would you have expected that both reactions would have had anegative change for delta S? How can you explain delta S is lessthan zero for these reactions?

Answer & Explanation Solved by verified expert

3.5 Ratings (584 Votes)

a the reduction potential of zn is less than that of hydrogen while reduciton potential of copper is high So Zn will be a better reducing agent and can reduce H to hydrogen and itself get See Answer

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Reaction	Cu(s) + 2H⁺(aq) <=> Cu²⁺(aq) +H2(g)	Zn(s) + 2H⁺(aq) <=> Zn²⁺(aq) +H2(g)
delta H	65 kJ/mol	-153 kJ/mol
delta S	-2.1 J/mol K	-23.1 J/mol K