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Massa rata-rata satu atom unsur Q adalah 2,654 x 10 -23 gram dan massa satu atom karbon (C-12) adalah 1,993 x 10 -23 gram. Massa atom relative ( Ar ) Q adalah

Massa rata-rata satu atom unsur Q adalah 2,654 x 10-23 gram dan massa satu atom karbon (C-12) adalah 1,993 x 10-23 gram. Massa atom relative (Ar) Q adalah

  1. fraction numerator 2 comma 654 space cross times space 10 to the power of negative 23 end exponent over denominator 12 cross times 1 comma 993 cross times 10 to the power of negative 23 end exponent end fraction g r a m. m o l to the power of negative 1 end exponent

  2. fraction numerator 1 comma 993 cross times 10 to the power of negative 23 end exponent over denominator begin display style 1 over 12 cross times 2 comma 654 cross times 10 to the power of negative 23 end exponent end style end fraction g r a m. m o l to the power of negative 1 end exponent

  3. fraction numerator 2 comma 654 cross times 10 to the power of negative 23 end exponent over denominator begin display style 1 over 12 cross times 1 comma 993 cross times 10 to the power of negative 23 end exponent end style end fraction g r a m. m o l to the power of negative 1 end exponent

  4. fraction numerator begin display style 1 over 12 cross times 2 comma 654 cross times 10 to the power of negative 23 end exponent end style over denominator 1 comma 993 cross times 10 to the power of negative 23 end exponent end fraction g r a m. m o l to the power of negative 1 end exponent

  5. fraction numerator begin display style 1 over 12 cross times 1 comma 993 cross times 10 to the power of negative 23 end exponent end style over denominator 2 comma 654 cross times 10 to the power of negative 23 end exponent end fraction g r a m. m o l to the power of negative 1 end exponent

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Pembahasan

U n t u k space m e n e n t u k a n space m a s s a space a t o m space r e l a t i f space s u a t u space u n s u r comma space d a p a t space d i l a k u k a n space d e n g a n space m e m b a n d i n g k a n y a space d e n g a n space 1 divided by 12 space m a s s a space i s o t o p space C minus 12  A r space Q equals fraction numerator m a s s a space 1 space a t o m space u n s u r space Q over denominator begin display style 1 over 12 end style x space m a s s a 1 a t o m space i s o t o p space C minus 12 end fraction  equals fraction numerator 2.654 x 10 to the power of negative 23 end exponent over denominator begin display style 1 over 12 end style cross times 1 comma 993 x 10 to the power of negative 23 end exponent end fraction g r a m divided by m o l

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Diketahui massa rata rata atom X adalah 2 , 66 x 1 0 − 23 dan massa 1 atom C − 12 = 1 , 99 × 1 0 − 23 gram . Tentukanlah massa atom relatif (Ar) unsur X tersebut!

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