Roboguru

Massa atom relatif () H = 1 dan O = 16, tetapan Av...

Massa atom relatif (begin mathsize 14px style italic A subscript r end style) H = 1 dan O = 16, tetapan Avogadro = begin mathsize 14px style 6 comma 02 cross times 10 to the power of 23 end style, jumlah molekul air yang terdapat dalam 180 gram begin mathsize 14px style H subscript 2 O end style adalah ...

  1. begin mathsize 14px style 6 comma 02 cross times 10 to the power of 22 end style molekul

  2. begin mathsize 14px style 6 comma 02 cross times 10 to the power of 23 end style molekul

  3. begin mathsize 14px style 6 comma 02 cross times 10 to the power of 24 end style molekul

  4. begin mathsize 14px style 12 comma 04 cross times 10 to the power of 23 end style molekul

  5. begin mathsize 14px style 12 comma 04 cross times 10 to the power of 24 end style molekul

Jawaban:

Menentukan nilai begin mathsize 14px style italic M subscript r space H subscript 2 O end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic M subscript r space H subscript 2 O end cell equals cell left parenthesis 2 cross times italic A subscript r space H right parenthesis plus left parenthesis 1 cross times italic A subscript r space O right parenthesis end cell row blank equals cell left parenthesis 2 cross times 1 right parenthesis plus left parenthesis 1 cross times 16 right parenthesis end cell row blank equals cell 18 space g space mol to the power of negative sign 1 end exponent end cell end table end style 

Menentukan nilai mol begin mathsize 14px style H subscript 2 O end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript H subscript 2 O end subscript end cell equals cell m over italic M subscript r end cell row blank equals cell 180 over 18 end cell row blank equals cell 10 space mol end cell end table end style 

Menentukan jumlah molekul begin mathsize 14px style H subscript 2 O end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Jumlah space molekul space H subscript 2 O end cell equals cell n cross times 6 comma 02 cross times 10 to the power of 23 end cell row blank equals cell 10 cross times 6 comma 02 cross times 10 to the power of 23 end cell row blank equals cell 6 comma 02 cross times 10 to the power of 24 space molekul end cell end table end style 

Jadi, jawaban yang benar adalah C.

0

Ruangguru

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Ruangguru

Produk Ruangguru

Produk Lainnya

Hubungi Kami

Ikuti Kami

©2021 Ruangguru. All Rights Reserved