Cobalt is a metallic element. One of the compounds of cobalt is vitamin B12, which has the formula C⁶³H⁸⁸CON¹⁴0¹⁴P. Another compound of cobalt is cobalt (II) chloride, which has the formula CoCl². Vitamin B12 is a molecule, whereas cobalt (II) chloride is not molecule. Which of the following statements is/are true?

1. The bond formed by the metallic element to the rest of the molecule in Vitamin B12 is ionic.
2. There are 6 elements found in vitamin B12, whereas there are only 2 elements in cobalt (II) chloride.
3. One mole of vitamin B12 contains 60 times the number of particles in one mole of cobalt (II) chloride.
4. There are 181 atoms in a molecule of vitamin B12, whereas there are only 3 atoms in the ionic formula of cobalt (II) chloride.

A) option 1 only
B) option 1 and option 3
C) option 2 and option 4
D) all options

My guess is C, because molecules are formed from covalent instead of ionic bonds. Can anyone clarify?

Thank you!​

Cobalt is a metallic element. One of the compounds of cobalt is vitamin B12, which has the formula C⁶³H⁸⁸CON¹⁴0¹⁴P. Another compound of cobalt is cobalt (II) chloride, which has the formula CoCl². Vitamin B12 is a molecule, whereas cobalt (II) chloride is not molecule. Which of the following statements is/are true?

1. The bond formed by the metallic element to the rest of the molecule in Vitamin B12 is ionic.
2. There are 6 elements found in vitamin B12, whereas there are only 2 elements in cobalt (II) chloride.
3. One mole of vitamin B12 contains 60 times the number of particles in one mole of cobalt (II) chloride.
4. There are 181 atoms in a molecule of vitamin B12, whereas there are only 3 atoms in the ionic formula of cobalt (II) chloride.

A) option 1 only
B) option 1 and option 3
C) option 2 and option 4
D) all options

My guess is C, because molecules are formed from covalent instead of ionic bonds. Can anyone clarify?

Thank you!​

Jadi jawaban yang sesuai adalah C. opsi 2 dan opsi 4.

Pembahasan

  • Ikatan antara unsur logam Co dengan molekul Vit B-12 bukanlah ikatan ionik, melainkan ikatan kovalen karena terdapat pasangan elektron bersama di dalamnya. Kalau dilihat akan kompleks sebenarnya. Kalau CoCl₂ kan termasuk senyawa ionik, yang terbentuk atas unsur logam dan unsur non logam, jelas ikatan terjadi karena interaksi ionik (beda elektronegativitas yang tinggi) jadi bisa dikatan terbentuk oleh ikatan ionik.
    Pengertian senyawa molekul dan senyawa ionik ==> tidak sesederhana senyawa biner saja ya :D.
  • Ada 6 jenis unsur dalam Vit B-12 jelas :
    C = karbon
    H = hidrogen
    Co = cobalt
    N = nitrogen
    O = oksigen
    P = fosfor
  • Sesuai dengan bilangan avogadro ya,
    Satu mol senyawa/unsur/molekul akan memiliki jumlah partikel yang sama dengan bilangan avogadro.
    Jadi : jumlah partikel dari 1 mol Vit B-12 = jumlah partikel dari 1 mol cobalt (II) klorida.
  • Jumlah atom = 63+88+1+14+14+1 = 181 atoms
    Oke cocok ya. Angka itu adalah jumlah atom masing-masing unsur sesuai rumus molekul yang kamu berikan.

—————————————————————————————————-

Pelajari lebih lanjut

  • Materi tentang bilangan avogadro :
    brainly.co.id/tugas/9979067
  • Materi tentang hukum dasar kimia :
    brainly.co.id/tugas/22667817
  • Materi tentang cara menghitung jumlah partikel : brainly.co.id/tugas/178366

—————————————————————————————————-

Detail jawaban

Mapel : Kimia
Kelas  : X
Bab     : Hukum Dasar Kimia
Kode   : 10.7.6

—————————————————————————————————-

 

Sekolah Menengah Atas

Kimia

 

Sumber: Brainly