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Perhatikan data dalam table berikut!     Apabila massa rata-rata unsur X adalah 379,64 amu, berapakah komposisi kelimpahan isotop unsur X tersebut?

Pertanyaan

Perhatikan data dalam table berikut!
 


 

Apabila massa rata-rata unsur X adalah 379,64 amu, berapakah komposisi kelimpahan isotop unsur X tersebut?space

Pembahasan Soal:

Total jumlah kelimpahan isotop harus 100%, maka:
 

percent sign X subscript 378 plus percent sign X subscript 383 equals 100 percent sign 
percent sign X subscript 383 equals 100 percent sign minus sign percent sign X subscript 378
 

Maka kelimpahan kedua isotop tersebut adalah:
 

table attributes columnalign right center left columnspacing 0px end attributes row cell Ar space X end cell equals cell fraction numerator percent sign X subscript 378 middle dot massanya plus percent sign X subscript 383 middle dot massanya over denominator 100 percent sign end fraction end cell row cell 379 comma 64 end cell equals cell fraction numerator percent sign X subscript 378 middle dot 377 comma 9 plus percent sign X subscript 383 middle dot 382 comma 98 over denominator 100 percent sign end fraction end cell row cell 37964 percent sign end cell equals cell 377 comma 9 middle dot percent sign X subscript 378 plus left parenthesis 100 percent sign minus sign percent sign X subscript 378 right parenthesis middle dot 382 comma 98 end cell row cell 37964 percent sign end cell equals cell 377 comma 9 middle dot percent sign X subscript 378 plus 38298 percent sign minus sign 382 comma 98 middle dot percent sign X subscript 378 end cell row cell negative sign 334 percent sign end cell equals cell 377 comma 9 middle dot percent sign X subscript 378 minus sign 382 comma 98 middle dot percent sign X subscript 378 end cell row cell negative sign 334 percent sign end cell equals cell negative sign 5 comma 08 middle dot percent sign X subscript 378 end cell row cell percent sign X subscript 378 end cell equals cell fraction numerator negative sign 334 percent sign over denominator negative sign 5 comma 08 end fraction end cell row cell percent sign X subscript 378 end cell equals cell 65 comma 7 percent sign end cell end table
 

Dengan Demikian maka:
 

percent sign X subscript 383 equals 100 percent sign minus sign percent sign X subscript 378 equals 100 percent sign minus sign 65 comma 7 percent sign equals 34 comma 3 percent sign
 

Oleh karena itu, komposisi kelimpahan kedua isotop berurut adalah:
 

X subscript 378 space colon space X subscript 383 equals 65 comma 7 percent sign colon 34 comma 3 percent sign.space

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 04 Mei 2021

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