<img align="middle" alt="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" class="Wirisformula" data-custom-editor="chemistry" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ class=¨wrs_chemistry¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«msub»«mi mathvariant=¨normal¨»M«/mi»«mi mathvariant=¨normal¨»r«/mi»«/msub»«mo»§#160;«/mo»«msub»«mi»MgSO«/mi»«mn»4«/mn»«/msub»«mo»§#183;«/mo»«mn»7«/mn»«msub»«mi mathvariant=¨normal¨»H«/mi»«mn»2«/mn»«/msub»«mi mathvariant=¨normal¨»O«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«msub»«mi mathvariant=¨normal¨»M«/mi»«mi mathvariant=¨normal¨»r«/mi»«/msub»«mo»§#160;«/mo»«msub»«mi»MgSO«/mi»«mn»4«/mn»«/msub»«mo»+«/mo»«mo»(«/mo»«mn»7«/mn»«mo»§#215;«/mo»«msub»«mi mathvariant=¨normal¨»M«/mi»«mi mathvariant=¨normal¨»r«/mi»«/msub»«mo»§#160;«/mo»«mn»7«/mn»«msub»«mi mathvariant=¨normal¨»H«/mi»«mn»2«/mn»«/msub»«mi 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style="max-width: none; vertical-align: -52px;" width="456" />&nbsp;

 
Jadi, massa molekul relatifnya adalah 246.

Diketahui massa atom relatif beberapa unsur sebagai berikut.

<img align="middle" alt="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" class="Wirisformula" data-custom-editor="chemistry" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ class=¨wrs_chemistry¨»«mstyle mathsize=¨14px¨»«mrow»«mi mathvariant=¨normal¨»H«/mi»«mo»=«/mo»«mn»1«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi mathvariant=¨normal¨»C«/mi»«mo»=«/mo»«mn»12«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi mathvariant=¨normal¨»N«/mi»«mo»=«/mo»«mn»14«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi mathvariant=¨normal¨»O«/mi»«mo»=«/mo»«mn»16«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi»Na«/mi»«mo»=«/mo»«mn»23«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mspace linebreak=¨newline¨/»«mi»Mg«/mi»«mo»=«/mo»«mn»24«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi»Al«/mi»«mo»=«/mo»«mn»27«/mn»«mo»,«/mo»«mo»§#160;«/mo»«mi»dan«/mi»«mo»§#160;«/mo»«mi mathvariant=¨normal¨»S«/mi»«mo»=«/mo»«mn»32«/mn»«/mrow»«/mstyle»«/math»" height="33" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -19px;" width="260" />

Tentukan massa molekul relatif (<img align="middle" alt="begin mathsize 14px style M subscript r end style" class="Wirisformula" data-custom-editor="chemistry" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ class=¨wrs_chemistry¨»«mstyle mathsize=¨14px¨»«msub»«mi mathvariant=¨normal¨»M«/mi»«mi mathvariant=¨normal¨»r«/mi»«/msub»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -5px;" width="16" />) dari&nbsp;<img align="middle" alt="begin mathsize 14px style Mg S O subscript 4 middle dot 7 H subscript 2 O end style" class="Wirisformula" data-custom-editor="chemistry" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ class=¨wrs_chemistry¨»«mstyle mathsize=¨14px¨»«mrow»«msub»«mi»MgSO«/mi»«mn»4«/mn»«/msub»«mo»§#183;«/mo»«mn»7«/mn»«msub»«mi mathvariant=¨normal¨»H«/mi»«mn»2«/mn»«/msub»«mi mathvariant=¨normal¨»O«/mi»«/mrow»«/mstyle»«/math»" height="15" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -5px;" width="90" />.<img align="middle" alt="begin mathsize 14px style space end style" class="Wirisformula" data-custom-editor="chemistry" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨ class=¨wrs_chemistry¨»«mstyle mathsize=¨14px¨»«mo»§#160;«/mo»«/mstyle»«/math»" height="5" role="math" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAFCAYAAABirU3bAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAEx0lWhwAAAAxJREFUeNpjYKABAAAAVQAB8vOvGAAAAIV0RVh0TWF0aE1MADxtYXRoIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8xOTk4L01hdGgvTWF0aE1MIiBjbGFzcz0id3JzX2NoZW1pc3RyeSI+PG1zdHlsZSBtYXRoc2l6ZT0iMTRweCI+PG1vPiYjeEEwOzwvbW8+PC9tc3R5bGU+PC9tYXRoPoR4GzYAAAAASUVORK5CYII=" style="max-width: none; vertical-align: -1px;" width="4" />&nbsp;

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