{"id":316300,"date":"2023-06-07T09:06:00","date_gmt":"2023-06-07T02:06:00","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=316300"},"modified":"2023-06-06T16:07:43","modified_gmt":"2023-06-06T09:07:43","slug":"massa-molekul-relatif","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/kimia\/massa-molekul-relatif\/","title":{"rendered":"Rumus Massa Molekul Relatif (Mr) Pengertian dan Fungsi"},"content":{"rendered":"\n
\"Rumus<\/figure>\n\n\n\n

Quipperian, tahukah kamu apa yang dimaksud dengan molekul? Molekul adalah gabungan dari dua atau lebih atom dengan perbandingan tertentu.<\/p>\n\n\n\n

Molekul ini dapat dihitung massanya, yaitu dengan cara menghitung massa molekul relatifnya (Mr). Apa itu massa molekul relatif? Bagaimana rumusnya? Yuk, cari tahu dalam pembahasan berikut ini.<\/p>\n\n\n\n

Pengertian Massa Molekul Relatif<\/h2>\n\n\n\n

Dalam kimia, kamu tentu sering mendengar istilah molekul. Nah, molekul ini adalah gabungan dari dua atau lebih atom dengan perbandingan tertentu.<\/p>\n\n\n\n

Molekul yang terdiri dari gabungan atom atau unsur yang sama disebut molekul unsur. Sementara, molekul yang terdiri dari gabungan atom-atom berbeda disebut molekul senyawa.<\/p>\n\n\n\n

Baik molekul unsur maupun molekul senyawa dapat dihitung nilai massanya. Bagaimana caranya? Salah satu caranya adalah dengan menghitung massa molekul relatif (Mr).<\/p>\n\n\n\n

Massa molekul relatif adalah gabungan penjumlahan nilai massa atom relatif (Ar) dari atom-atom pembentuk molekul tersebut. Massa molekul relatif juga dapat didefinisikan sebagai perbandingan massa antara 1 molekul atau 1 satuan dari suatu zat terhadap 112 massa satu atom isotop karbon 12.<\/p>\n\n\n\n

Dengan ditemukannya cara menghitung massa molekul relatif ini, memudahkan para ilmuwan untuk mengetahui massa suatu molekul karena ukurannya yang sangat kecil sehingga tidak memungkinkan untuk dihitung menggunakan timbangan atau neraca.<\/p>\n\n\n\n

Selain massa atom relatif (Ar), kamu juga perlu memahami massa molekul relatif (Mr). Sebab, keduanya sering digunakan dalam perhitungan kimia.<\/p>\n\n\n\n

Fungsi Massa Molekul Relatif<\/h2>\n\n\n\n

Massa molekul relatif memiliki fungsi utama untuk menghitung massa suatu molekul. Jadi, istilah ini hanya berlaku untuk zat-zat yang terdiri atas molekul.<\/p>\n\n\n\n

Sementara jika ingin menghitung massa suatu atom, maka kamu harus menggunakan massa atom relatif atau Ar.<\/p>\n\n\n\n

Massa molekul relatif (Mr) juga dapat digunakan untuk menentukan rumus molekul. Rumus molekul ini digunakan untuk menggambarkan jumlah atom setiap unsur penyusun suatu molekul.<\/p>\n\n\n\n

Lebih lanjut, Mr juga sering digunakan dalam rumus menentukan molaritas, titrasi asam basa, titik didih, dan perhitungan kimia lainnya. Itulah mengapa, pentingnya memahami Mr.<\/p>\n\n\n\n

Rumus Massa Molekul Relatif<\/h2>\n\n\n\n

Ingat, massa molekul relatif adalah gabungan penjumlahan nilai massa atom relatif (Ar) dari atom-atom pembentuk molekul tersebut.<\/p>\n\n\n\n

Dari definisi massa molekul relatif ini, sebenarnya sudah bisa diketahui rumusnya, yaitu:<\/p>\n\n\n\n

\nMr molekul AxBy = (x. Ar A) + (y. Ar B) + dst\n<\/strong><\/p>\n\n\n\n

Selain itu, massa molekul relatif juga dapat ditentukan dengan rumus:<\/p>\n\n\n\n

\n

Mr molekul atau zat X  = <\/p>\n

\n\t

massa rata-rata satu molekul atau zat X<\/p>\n\t\n\t

1\/12 x massa atom isotop C-12<\/p>\n<\/div>\n<\/div>\n\n\n\n

Selain menghitung dengan rumus massa molekul relatif, massa suatu molekul juga bisa dihitung di laboratorium dengan berbagai metode.<\/p>\n\n\n\n

Lalu, apa satuan yang digunakan untuk massa molekul relatif? Baik massa molekul relatif maupun massa atom relatif tidak memiliki satuan karena keduanya merupakan hasil perbandingan. Jadi, tidak memiliki satuan.<\/p>\n\n\n\n

Perbedaan Massa Atom Relatif dan Massa Molekul Relatif<\/h2>\n\n\n\n

Sekilas, massa atom relatif (Ar) <\/a>dan massa molekul relatif (Mr) ini terlihat sama. Padahal, keduanya adalah dua hal yang berbeda.<\/p>\n\n\n\n

Apa saja perbedaan massa atom relatif dan massa molekul relatif? Berikut penjelasannya.<\/p>\n\n\n\n

1. Pengertian<\/strong><\/p>\n\n\n\n

Perbedaan massa atom relatif dan massa molekul relatif dapat kamu lihat dari pengertian keduanya.<\/p>\n\n\n\n

Massa atom relatif (Ar) adalah perbandingan massa suatu atom dengan massa atom lainnya. Sementara massa molekul relatif adalah gabungan penjumlahan nilai massa atom relatif (Ar) dari atom-atom pembentuk molekul tersebut.<\/p>\n\n\n\n

2. Fungsi<\/strong><\/p>\n\n\n\n

Perbedaan selanjutnya bisa dilihat dari fungsinya di mana massa atom relatif atau Ar digunakan untuk menghitung massa suatu atom. Sementara itu, massa molekul relatif digunakan untuk menghitung massa suatu molekul.<\/p>\n\n\n\n

Perlu diketahui, atom adalah unsur terkecil dari suatu zat atau materi yang dapat berdiri sendiri maupun bergabung dengan atom lain membentuk suatu senyawa. Sementara, molekul adalah gabungan dari dua atau lebih atom yang sejenis maupun berbeda.<\/p>\n\n\n\n

3. Rumus yang Digunakan<\/strong><\/p>\n\n\n\n

Perbedaan selanjutnya juga bisa dilihat dari rumus yang digunakan untuk menghitung massa Ar dan Mr.<\/p>\n\n\n\n

Adapun rumus yang digunakan untuk menghitung massa Ar adalah:<\/p>\n\n\n\n

\n

Ar unsur X  = <\/p>\n

\n\t

massa satu atom unsur X<\/p>\n\t\n\t

1\/12 x massa atom isotop C-12<\/p>\n<\/div>\n<\/div>\n\n\n\n

Sementara rumus untuk menghitung massa Mr adalah:<\/p>\n\n\n\n

Mr molekul AxBy = (x. Ar A) + (y. Ar B) + dst<\/p>\n\n\n\n

Selain itu, massa Mr juga dapat dihitung dengan rumus:<\/p>\n\n\n\n

\n

Mr molekul atau zat X  = <\/p>\n

\n\t

massa rata-rata satu molekul atau zat X<\/p>\n\t\n\t

1\/12 x massa atom isotop C-12<\/p>\n<\/div>\n<\/div>\n\n\n\n

Meskipun keduanya memiliki perbedaan, tetapi massa atom relatif maupun massa molekul relatif sama-sama sering digunakan dalam perhitungan kimia atau stoikiometri.<\/p>\n\n\n\n

Contoh Soal Massa Molekul Relatif dan Pembahasannya<\/h2>\n\n\n\n

Untuk mengasah kemampuan, yuk simak beberapa contoh soal massa molekul relatif dan pembahasannya berikut ini.<\/p>\n\n\n\n

#1 Soal Massa Molekul Relatif<\/h3>\n\n\n\n

Suatu senyawa X memiliki rumus empiris CH2<\/sub>O. Jika diketahui massa molekul relatif (Mr) senyawa X adalah 60, tentukan rumus molekul senyawa tersebut. (Ar C = 12, Ar H = 1, Ar O = 16).<\/p>\n\n\n\n

Pembahasan<\/strong><\/p>\n\n\n\n

Mr X = Mr (CH2<\/sub>O)n<\/sub> = 60<\/p>\n

   = (12 + 2 + 16)n = 60<\/p>\n

   = 30n = 60 <\/p>\n

   n = 2<\/p>\n\n\n\n

Jadi, rumus molekul senyawa X adalah (CH2<\/sub>O)2<\/sub> = C2<\/sub>H4<\/sub>O2<\/sub> = CH3<\/sub>COOH (asam asetat atau cuka).<\/p>\n\n\n\n

#2 Soal Massa Molekul Relatif<\/h3>\n\n\n\n

Hitunglah massa molekul relatif senyawa (NH2<\/sub>)4<\/sub>SO4<\/sub>, jika diketahui Ar H = 1, N =14, O = 16, dan S = 32.<\/p>\n\n\n\n

Pembahasan<\/strong><\/p>\n\n\n\n

Mr (NH2<\/sub>)4<\/sub>SO4<\/sub> = (2 x Ar N) + (2 x 4 x Ar H) + (1 x Ar S) + (4 x Ar O)<\/p>\n

     = (2 x 14) + (8 x 1) + (1 x 32) + (4 x 16)<\/p>\n

     = 30n = 60 <\/p>\n

     = 132<\/p>\n\n\n\n

Jadi, massa molekul relatif (NH2<\/sub>)4<\/sub>SO4<\/sub> adalah 132<\/p>\n\n\n\n

#3 Soal Massa Molekul Relatif<\/h3>\n\n\n\n

Jika Ar H = 1, Ar O = 16, dan massa 1 atom 12<\/sup>C = 2 x 10-23<\/sup> g, tentukan massa 200 molekul air.<\/p>\n\n\n\n

Pembahasan<\/strong><\/p>\n\n\n\n

Mr H2<\/sub>O = (2 x Ar H) + (1 x Ar O)<\/p>\n

   = (2 x 1 ) + (1 x 16)<\/p>\n

   = 18 <\/p>\n\n\n\n

\n

Mr H2<\/sub>O  = <\/p>\n

\n\t

massa satu molekul H2O<\/p>\n\t\n\t

1\/12 x massa atom isotop C-12<\/p>\n<\/div>\n<\/div>\n\n\n\n\n

Massa satu molekul H2O = Mr H2<\/sub>O x 1\/12 x massa atom isotop C-12<\/p>\n

   = 18 x 1\/12 x 2 x 10-23<\/sup><\/p>\n

   3 x 10-23<\/sup> <\/p>\n\n\n\n

Jadi, massa 200 molekul air = 200 x 3 x 10-23<\/sup> = 6 x 10-21<\/sup> g.<\/p>\n\n\n\n

#4 Soal Massa Molekul Relatif<\/h3>\n\n\n\n

Hitung Mr Fe2<\/sub>(SO4<\/sub>)3<\/sub>, jika diketahui Ar Fe = 56, Ar S = 32, dan Ar O = 16<\/p>\n\n\n\n

Pembahasan<\/strong><\/p>\n\n\n\n

Mr Fe2<\/sub>(SO4<\/sub>)3<\/sub> = (2 x Ar Fe) + (3 x Ar S) + (3 x 4 x Ar O)<\/p>\n

   = (2 x 56) + (3 x 32) + (12 x 16)<\/p>\n

   = 400<\/p>\n\n\n\n

Jadi, Mr Fe2<\/sub>(SO4<\/sub>)3<\/sub> adalah 400.<\/p>\n\n\n\n

Demikian pembahasan mengenai massa molekul relatif (Mr). Sangat mudah, bukan menghitung massa Mr ini?<\/p>\n\n\n\n

Agar kamu semakin jago dalam menghitung massa molekul relatif ini, cobalah untuk sering-sering mengerjakan latihan soalnya. Ingat, practice makes perfect. Sampai jumpa di pembahasan Quipper Blog berikutnya, ya!<\/p>\n\n\n\n

Sumber<\/strong><\/p>\n\n\n\n

Suyatno, dkk. 2007. Kimia untuk SMA\/MA Kelas X. Jakarta: Grasindo
Suyatno, dkk. 2007. Kimia untuk SMA\/MA Kelas X. Jakarta: Grasindo
Aprilyanti, Selvia. 2020. Kimia Terapan (Aplikasi untuk Teknik Mesin). Jawa Tengah: CV. Sarnu Untung
Ratna, Ika Stri dan Andriyatie Poerwaningsih. 2015. Explore Kimia untuk SMA\/MA Kelas X. Bandung: Penerbit Duta
Sunarya, Yayan dan Agus Setiabudi. 2007. Mudah dan Aktif Belajar Kimia. Bandung: PT Setia Purna Inves<\/p>\n","protected":false},"excerpt":{"rendered":"

Quipperian, tahukah kamu apa yang dimaksud dengan molekul? Molekul adalah gabungan dari dua atau lebih atom dengan perbandingan tertentu. 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