Roboguru

Diketahui data potensial reduksi sebagai berikut: ...

Diketahui data potensial reduksi sebagai berikut:

  • begin mathsize 14px style E degree space Ca to the power of 2 plus sign left enclose Ca equals minus sign 2 comma 87 space Volt end enclose end style 
  • begin mathsize 14px style E degree space Pb to the power of 2 plus sign left enclose Pb equals minus sign 0 comma 13 space Volt end enclose end style 
  • begin mathsize 14px style E degree space Mg to the power of 2 plus sign left enclose Mg equals minus sign 2 comma 37 space Volt end enclose end style
  • begin mathsize 14px style E degree space Au to the power of 3 plus sign left enclose Au equals plus 1 comma 5 space Volt end enclose end style  

Reaksi yang dapat berlangsung adalah....space

  1. begin mathsize 14px style Mg and Ca to the power of 2 plus sign yields Mg to the power of 2 plus sign and Ca end style 

  2. begin mathsize 14px style Ca and Mg yields Ca to the power of 2 plus sign and Mg to the power of 2 plus sign end style 

  3. begin mathsize 14px style Pb and Mg to the power of 2 plus sign yields Pb to the power of 2 plus sign and Mg end style 

  4. begin mathsize 14px style Mg and Pb to the power of 2 plus sign yields Mg to the power of 2 plus sign and Pb end style 

  5. begin mathsize 14px style Pb to the power of 2 plus sign and Au to the power of 3 plus sign yields Pb and Au end style 

Jawaban:

Untuk mengetahui reaksi dapat berlangsung secara spontan atau tidak ditentukan berdasarkan potensial sel begin mathsize 14px style open parentheses E degree sel close parentheses end style. Reaksi dikatakan berlangsung/ spontan apabila nilai potensial sel begin mathsize 14px style open parentheses E degree sel close parentheses end style positif. Untuk menghitung potensial sel (begin mathsize 14px style E degree sel end style) pada sel volta, menggunakan rumus :

begin mathsize 14px style E degree sel double bond E degree reduksi bond E degree oksidasi end style  

Berdasarkan persamaan reaksi sel volta di atas, maka reaksi yang berlangsung spontan adalah 

begin mathsize 14px style Mg and Pb to the power of 2 plus sign yields Mg to the power of 2 plus sign and Pb end style

begin mathsize 14px style E degree sel double bond E degree Pb bond E degree Mg E degree sel equals minus sign 0 comma 13 minus sign open parentheses negative sign 2 comma 37 close parentheses E degree sel equals plus space 2 comma 24 space Volt end style 

Jadi, jawaban yang tepat adalah D

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