The coefficient in a chemical formula represents the amount of each chemical present. The amount of a substance is measured in moles.
 
        
             
        
        
        
To find - Identify what kind of ligand (weak or strong), what kind 
               of wavelength (long or short), what kind of spin (high spin or 
               low spin) and whether it is paramagnetic or diamagnetic for 
               the following complexes.
               1. [Mn(CN)6]4-
               2. [Fe(OH)(H2O)5]2
               3. [CrCl4Br2]3-
Step - by - Step Explanation -
1.
[Mn(CN)⁶]⁴⁻ :
Ligand - Strong
Wavelength - Short
Spin - Low spin
Number of unpaired electrons = 1 ∴ paramagnetic.
2.
[Fe(OH)(H₂O)₅]²⁺ :
Ligand - Weak ( both OH⁻ and H₂O )
Wavelength - Long
Spin - High spin
Number of unpaired electrons = 5 ∴ paramagnetic.
3.
[CrCl₄Br₂]³⁻ :
Ligand - Weak ( both Br⁻ and Cl⁻ )
Wavelength - Long
Spin - High spin
Number of unpaired electrons = 3 ∴ paramagnetic.
 
        
             
        
        
        
Answer:
12 grams of hydrogen gas
and 56 grams of nitrogen gas
The molar mass of ammonia is 17 g/mol.
68 grams of ammonia corresponds to  
17g/mol
68g
 =4moles
4 moles of ammonia will be obtained from  
2
4×1
 =2  moles of nitrogen and  
2
4×3
 =6  moles of hydrogen.
The molar masses of nitrogen and hydrogen are 28 g/mol and 2 g/mol respectively.
2 moles of nitrogen corresponds to 2×28=56  grams.
6 moles of hydrogen corresponds to 6×2=12  grams.
 
        
             
        
        
        
The answer is 2 atm. I guessed on the problem and got it right. I don’t know the work though. 
 
        
             
        
        
        
The answer is B. 
 occur gradually over millions of years.