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Suatu senyawa  terdiri atas 2 atom A, 1 atom B, da...

Suatu senyawa A subscript 2 B C subscript 4 terdiri atas 2 atom A, 1 atom B, dan 4 atom C, memiliki besar M subscript r equals 98. Jika diketahui A subscript r space A equals 1 comma space A subscript r space B equals 32, maka besar A subscript r space C adalah ....

Jawaban:

Massa molekul relatif M subscript r adalah penjumlahan A subscript r atom-atom penyusunnya, maka

table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript r space A subscript 2 B C subscript 4 end cell equals cell left curly bracket left parenthesis 2 cross times A subscript r space A right parenthesis plus left parenthesis 1 cross times A subscript r space B right parenthesis plus left parenthesis 4 cross times A subscript r space C right parenthesis right curly bracket end cell row cell 98 space gram space mol to the power of negative sign 1 end exponent end cell equals cell left curly bracket left parenthesis 2 cross times 1 space gram space mol to the power of negative sign 1 end exponent right parenthesis plus left parenthesis 1 cross times 32 space gram space mol to the power of negative sign 1 end exponent right parenthesis plus left parenthesis 4 cross times A subscript r space C right parenthesis right curly bracket end cell row cell A subscript r space C end cell equals cell fraction numerator 98 space gram space mol to the power of negative sign 1 end exponent minus sign left parenthesis 34 space gram space mol to the power of negative sign 1 end exponent right parenthesis space over denominator 4 end fraction end cell row cell A subscript r space C end cell equals cell fraction numerator 64 space gram space mol to the power of negative sign 1 end exponent space over denominator 4 end fraction end cell row cell A subscript r space C end cell equals cell 16 space gram space mol to the power of negative sign 1 end exponent   end cell end table 

Jadi massa atom relatif senyawa C adalah bold 16 bold space bold gram bold space bold mol to the power of bold minus sign bold 1 end exponent.space  

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