<u>Answer:</u> The volume of barium chlorate is 195.65 mL
<u>Explanation:</u>
To calculate the volume of solution, we use the equation used to calculate the molarity of solution:

Given mass of barium chlorate = 25.0 g
Molar mass of barium chlorate = 304.23 g/mol
Molarity of solution = 0.420 mol/L
Volume of solution = ?
Putting values in above equation, we get:

Hence, the volume of barium chlorate is 195.65 mL
 
        
             
        
        
        
Answer:
Option E, Half life = 
Explanation:
For a first order reaction, rate constant and half-life is related as:
             
Where,
 = Half life
 = Half life
k = Rate constant
Rate constant given = 
 

So, the correct option is option E.
 
        
             
        
        
        
Answer:
a - the position of equilibrium lies far to the right, with products being favored. 
Explanation:
 
        
                    
             
        
        
        
Theodore Richards;  first scienstist to recieve nobel prize in Chemistry, earning the award "in recognition of his exact determinations of atomic weights of a large number of chemical elements."
 
        
             
        
        
        
<h3><u>Answer;</u></h3>
Molarity = 0.25 M
<h3><u>Explanation;</u></h3>
Molarity is given by moles/Liter.
First we find moles: 
Number of moles = Mass /molar mass
= (10.7g NH4Cl)/(53.5g/mol NH4Cl) 
 = 0.200 moles NH4Cl  
Then  we convert to liters: 
= (800mL)*(1L/1000mL) = 0.800L  
Therefore; molarity = 0.2moles/0.8L 
                                 = 0.25M