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Diberikan data setengah reaksi sebagai berikut. Zn2+(aq)+2e→Zn(s) E∘=−0,76 V Mg2+(aq)+2e→Mg(s) E∘=−2,24 V  Fe2+(aq)+2e→Fe(s) E∘=−0,44 V  Sn2+(aq)+2e→Sn(s) E∘=+0,14 V  Al3+(aq)+3e→Al(s) E∘=−1,76 V   Reaksi yang dapat menghasilkan arus listrik adalah ...

Pertanyaan

Diberikan data setengah reaksi sebagai berikut.

  1. Zn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e yields Zn open parentheses italic s close parentheses space E degree equals minus sign 0 comma 76 space V
  2. Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e yields Mg open parentheses italic s close parentheses space E degree equals minus sign 2 comma 24 space V 
  3. Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e yields Fe open parentheses italic s close parentheses space E degree equals minus sign 0 comma 44 space V 
  4. Sn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus 2 e yields Sn open parentheses italic s close parentheses space E degree equals plus 0 comma 14 space V 
  5. Al to the power of 3 plus sign left parenthesis italic a italic q right parenthesis plus 3 e yields Al open parentheses italic s close parentheses space E degree equals minus sign 1 comma 76 space V  

Reaksi yang dapat menghasilkan arus listrik adalah ...space

  1. Zn open parentheses italic s close parentheses and Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Zn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Mg open parentheses italic s close parentheses space 

  2. Sn open parentheses italic s close parentheses and Al to the power of 3 plus sign left parenthesis italic a italic q right parenthesis yields Sn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Al open parentheses italic s close parentheses space 

  3. Mg open parentheses italic s close parentheses and Sn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Sn open parentheses italic s close parentheses space 

  4. Fe open parentheses italic s close parentheses and Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Fe to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Mg open parentheses italic s close parentheses space 

  5. Al open parentheses italic s close parentheses and Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Al to the power of 3 plus sign left parenthesis italic a italic q right parenthesis plus Mg open parentheses italic s close parentheses space 

B. Rohmawati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

 reaksi yang dapat menghasilkan arus listrik adalah Mg open parentheses italic s close parentheses and Sn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Sn open parentheses italic s close parentheses dengan potensial reduksi sel yaitu 2,10 V.space 

Pembahasan

Jadi, jawaban yang benar adalah C.

Reaksi yang dapat menghasilkan arus listrik adalah reaksi spontan. Reaksi spontan ditandai dengan nilai potensial reduksi sel bernilai positif. Maka pada soal perlu ditentukan potensial reduksi sel tiap opsi jawaban, yaitu:

E degree sel double bond E degree katode bond E degree anode E degree sel double bond E degree reduksi bond E degree oksidasi 

table attributes columnalign right center left columnspacing 0px end attributes row cell A point space E degree sel end cell equals cell E degree reduksi bond E degree oksidasi end cell row blank equals cell E degree Mg bond E degree Zn end cell row blank equals cell negative sign 2 comma 24 minus sign left parenthesis minus sign 0 comma 76 right parenthesis end cell row blank equals cell negative sign 1 comma 48 space V end cell row cell B point space E degree sel end cell equals cell E degree reduksi bond E degree oksidasi end cell row blank equals cell E degree Al bond E degree Sn end cell row blank equals cell negative sign 1 comma 76 minus sign 0 comma 14 end cell row blank equals cell negative sign 1 comma 90 space V end cell row cell C point space E degree sel end cell equals cell E degree reduksi bond E degree oksidasi end cell row blank equals cell E degree Sn bond E degree Mg end cell row blank equals cell 0 comma 14 minus sign left parenthesis minus sign 2 comma 24 right parenthesis end cell row blank equals cell 2 comma 10 space V end cell row cell D point space E degree sel end cell equals cell E degree reduksi bond E degree oksidasi end cell row blank equals cell E degree Mg bond E degree Fe end cell row blank equals cell negative sign 2 comma 24 minus sign left parenthesis minus sign 0 comma 44 right parenthesis end cell row blank equals cell negative sign 1 comma 80 space V end cell row cell E point space E degree sel end cell equals cell E degree reduksi bond E degree oksidasi end cell row blank equals cell E degree Mg bond E degree Al end cell row blank equals cell negative sign 2 comma 24 minus sign left parenthesis minus sign 1 comma 76 right parenthesis end cell row blank equals cell negative sign 0 comma 48 space V end cell end table  

Oleh karena itu, reaksi yang dapat menghasilkan arus listrik adalah Mg open parentheses italic s close parentheses and Sn to the power of 2 plus sign left parenthesis italic a italic q right parenthesis yields Mg to the power of 2 plus sign left parenthesis italic a italic q right parenthesis plus Sn open parentheses italic s close parentheses dengan potensial reduksi sel yaitu 2,10 V.space 

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