Diketahui massa 1 atom oksigen gram, jika massa atom C adalah gram, maka massa alom relatif O (Ar O) adalah .... gram mol−1

Pertanyaan

Diketahui massa 1 atom oksigen gram, jika massa atom C adalah gram, maka massa alom relatif O ( $\style{font-size:14px}{{\mathrm A}_{\mathrm r}\;\mathrm O}$ ) adalah .... $\style{font-size:14px}{\mathrm{gram}\;\mathrm{mol}^{-1}}$

$begin mathsize 14px style fraction numerator 2 comma 70 cross times 10 to the power of negative sign 23 end exponent over denominator 12 cross times 1 comma 99 cross times 10 to the power of negative sign 23 end exponent end fraction end style$
$begin mathsize 14px style fraction numerator 1 comma 99 cross times 10 to the power of negative sign 23 end exponent over denominator 1 over 12 cross times 2 comma 70 cross times 10 to the power of negative sign 23 end exponent end fraction end style$
$begin mathsize 14px style fraction numerator 2 comma 70 cross times 10 to the power of negative sign 23 end exponent over denominator 1 over 12 cross times 1 comma 99 cross times 10 to the power of negative sign 23 end exponent end fraction end style$
$begin mathsize 14px style fraction numerator 1 over 12 cross times 2 comma 70 cross times 10 to the power of negative sign 23 end exponent over denominator 1 comma 99 cross times 10 to the power of negative sign 23 end exponent end fraction end style$
$begin mathsize 14px style fraction numerator 1 over 12 cross times 1 comma 99 cross times 10 to the power of negative sign 23 end exponent over denominator 2 comma 70 cross times 10 to the power of negative sign 23 end exponent end fraction end style$

S. Lubis

Master Teacher

Mahasiswa/Alumni Universitas Sumatera Utara

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C.

Pembahasan

Untuk mengetahui massa atom relatif suatu unsur jika dibandingkan dengan massa atom adalah dengan membandingkan massa 1 atom unsur tersebut dengan massa atom karbon, dapat dirumuskan sebagai berikut:

$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell A subscript r space X end cell equals cell fraction numerator massa space 1 space atom space X over denominator 1 over 12 space massa space atom space C minus sign 12 end fraction end cell row cell A subscript r space O end cell equals cell fraction numerator massa space 1 space atom space O over denominator 1 over 12 space massa space atom space C minus sign 12 end fraction end cell row blank equals cell fraction numerator 2 comma 70 cross times 10 to the power of negative sign 23 end exponent over denominator 1 over 12 cross times 1 comma 99 cross times 10 to the power of negative sign 23 end exponent end fraction end cell end table end style$

Jadi, jawaban yang benar adalah C.