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Diketahui massa atom relatif beberapa unsur sebaga...

Diketahui massa atom relatif beberapa unsur sebagai berikut.

begin mathsize 14px style H equals 1 comma space C equals 12 comma space N equals 14 comma space O equals 16 comma space Na equals 23 comma space Mg equals 24 comma space Al equals 27 comma space dan space S equals 32 end style

Tentukan massa molekul relatif (begin mathsize 14px style M subscript r end style) dari begin mathsize 14px style Mg S O subscript 4 middle dot 7 H subscript 2 O end style.begin mathsize 14px style space end style 

  1. ...begin mathsize 14px style space end style 

  2. ...spacebegin mathsize 14px style space end style 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript r space Mg S O subscript 4 middle dot 7 H subscript 2 O end cell equals cell M subscript r space Mg S O subscript 4 plus left parenthesis 7 cross times M subscript r space 7 H subscript 2 O right parenthesis end cell row blank equals cell left square bracket A subscript r space Mg and A subscript r space S plus left parenthesis 4 cross times A subscript r space O right parenthesis right square bracket plus left parenthesis 7 cross times left square bracket left parenthesis 2 cross times A subscript r space H right parenthesis plus A subscript r space O right square bracket right parenthesis end cell row blank equals cell left square bracket 24 plus 32 plus left parenthesis 4 cross times 16 right parenthesis right square bracket plus left parenthesis 7 cross times left square bracket left parenthesis 2 cross times 1 right parenthesis plus 16 right square bracket right parenthesis end cell row blank equals cell 120 plus 126 end cell row blank equals 246 end table end style 


Jadi, massa molekul relatifnya adalah 246.

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