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Berapa mol dan berapa atom masing-masing unsur yang terdapat dalam zat-zat berikut?  4 g NaOH 10,3 g Na2​CO3​ 8 g Fe2​O3​

Pertanyaan

Berapa mol dan berapa atom masing-masing unsur yang terdapat dalam zat-zat berikut?space 

  1. 4 g NaOH
  2. 10,3 g begin mathsize 14px style Na subscript 2 C O subscript 3 end style
  3. 8 g begin mathsize 14px style Fe subscript 2 O subscript 3 end style 

I. Solichah

Master Teacher

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Pembahasan

Mol merupakan jumlah tertentu untuk menyatakan banyaknya suatu zat yang berukuran mikroskopis. Mol dilambangkan dengan (n) dirumuskan sebagai


n equals fraction numerator massa space open parentheses gram close parentheses over denominator Ar space atau space Mr end fraction 


Hubungan antara mol dan jumlah atom adalah


table attributes columnalign right center left columnspacing 0px end attributes row L equals cell mol cross times Bilangan space Avogadro end cell row blank equals cell mol cross times 6 comma 02 cross times 10 to the power of 23 space partikel end cell end table 

 

begin mathsize 14px style 1 point n subscript NaOH equals bevelled 4 over 40 equals 0 comma 1 space mol n subscript NaOH double bond n subscript Na double bond n subscript O double bond n subscript H N equals 0 comma 1 cross times 6 comma 02 cross times 10 to the power of 23 equals 6 comma 02 cross times 10 to the power of 22 space atom space O N equals 0 comma 1 cross times 6 comma 02 cross times 10 to the power of 23 equals 6 comma 02 cross times 10 to the power of 22 space atom space Na N equals 0 comma 1 cross times 6 comma 02 cross times 10 to the power of 23 equals 6 comma 02 cross times 10 to the power of 22 space atom space H  2. space n subscript Na subscript 2 C O subscript 3 end subscript equals bevelled fraction numerator 10 comma 3 over denominator 106 end fraction equals 0 comma 0972 space mol n subscript Na equals 2 cross times n subscript Na subscript 2 C O subscript 3 end subscript equals 0 comma 194 space mol N equals 0 comma 194 cross times 6 comma 02 cross times 10 to the power of 23 equals 1 comma 17 cross times 10 to the power of 23 space atom space Na n subscript C double bond n subscript Na subscript 2 C O subscript 3 end subscript equals 0 comma 0972 space mol N equals 0 comma 0972 cross times 6 comma 02 cross times 10 to the power of 23 equals 5 comma 85 cross times 10 to the power of 22 space atom space C n subscript O equals 3 cross times n subscript Na subscript 2 C O subscript 3 end subscript equals 0 comma 292 space mol N equals 0 comma 292 cross times 6 comma 02 cross times 10 to the power of 23 equals 1 comma 755 cross times 10 to the power of 23 space atom space O  3. space n subscript Fe subscript 2 O subscript 3 end subscript equals bevelled 8 over 160 equals 0 comma 05 space mol n subscript Fe equals 2 cross times n subscript Fe subscript 2 O subscript 3 end subscript equals 0 comma 1 space mol N equals 0 comma 1 cross times 6 comma 02 cross times 10 to the power of 22 equals 6 comma 02 cross times 10 to the power of 22 space atom space Fe n subscript O equals 3 cross times n subscript Fe subscript 2 O subscript 3 end subscript equals 0 comma 15 space mol N equals 0 comma 15 cross times 6 comma 02 cross times 10 to the power of 23 equals 9 comma 03 cross times 10 to the power of 22 space atom space O space end style

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