Answer:
Thats the solution to the question
Answer:
Central-metal oxidation state: +2
Coordination number: 6
Overall charge: -2
Explanation:
In the ion complex:
Na₂[Cr(NH₃)₂(NCS)₄]
The central-metal is Cr, the ligands are NH₃ and NCS.
The NH₃ is a neutral ligand, while NCS is an anionic ligand with -1 in charge.
The overall charge of the complex is:
2Na⁺ + [Cr(NH₃)₂(NCS)₄]⁻² → <em>-2</em>
As NCS gives -1 in charge and there are four NCS, The Cr must be in <em>+2</em> of oxidation state to give an overall charge of -2.
As Cr is bonded to 2 NH₃ and 4 NCS, the coordination number is 2+4 = <em>6</em>
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I hope it helps!
The molecular problem for aluminum oxide is Al2O3 Atomic mass of Al = 26.982 Atomic mass of O = 16 From the problem, 1 mole of AL2O3 contains: 2 g-atom of Al or 2 x 26.982 = 53.964 g 3 g-atom of O or 3 x 16 = 48 g the mass of 1 mole of Al2O3 is equal to 53.964 + 48 = 101.964 g
A is the answer. A gas never has a fixed volume or shape