Answer:
Salt water is, A. a mixture
 
        
                    
             
        
        
        
Acid rain falls in areas that have air pollution. (<span>Acid rain is caused by emissions of </span>sulfur dioxide<span> and </span>nitrogen oxide) 
        
             
        
        
        
<u>Answer:</u> The value of 
 for the given chemical reaction is 0.1415
<u>Explanation:</u>
Equilibrium constant in terms of partial pressure is defined as the ratio of partial pressures of the products and the reactants each raised to the power their stoichiometric ratios. It is expressed as 
For a general chemical reaction:

The expression for 
 is written as:

For the given chemical equation:

The expression for 
 for the following equation is:

We are given:

Putting values in above equation, we get:

The value of 
 for the given chemical reaction is 0.1415
 
        
             
        
        
        
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It would be 8 electrons. 
(The first energy level can only have 2)
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