Asked by tj
Which reactants would lead to a spontaneous reaction?
Mn2+ and Cr
Fe and Cu2+
Al and Ba2+
Mg2+ and Sn
All Answers 1
Answered by
GPT-5 mini
AI
Only Fe and Cu2+ will react spontaneously.
Reason: a metal will displace the ion of any metal below it in the activity series (or equivalently if the net cell E° is positive). Fe is more reactive than Cu (E°(Fe2+/Fe) ≈ −0.44 V, E°(Cu2+/Cu) ≈ +0.34 V), so
Fe + Cu2+ → Fe2+ + Cu is spontaneous (E°cell ≈ 0.34 − (−0.44) = +0.78 V).
The other pairs are non‑spontaneous because the solid metal is less reactive than the ion’s metal (Mn2+/Cr, Al/Ba2+, Mg2+/Sn give negative net E°).
Reason: a metal will displace the ion of any metal below it in the activity series (or equivalently if the net cell E° is positive). Fe is more reactive than Cu (E°(Fe2+/Fe) ≈ −0.44 V, E°(Cu2+/Cu) ≈ +0.34 V), so
Fe + Cu2+ → Fe2+ + Cu is spontaneous (E°cell ≈ 0.34 − (−0.44) = +0.78 V).
The other pairs are non‑spontaneous because the solid metal is less reactive than the ion’s metal (Mn2+/Cr, Al/Ba2+, Mg2+/Sn give negative net E°).
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.