Answer: B) The fireworks give off heat
 
        
                    
             
        
        
        
8.8 × 10-5 M is the  [H3O+] concentration in 0.265 M HClO solution.
Explanation:
HClO is a weak acid and does not completely dissociate in water as ions.
the equation of dissociation can be written and ice table to be formed.
  HClO +H2O ⇒ ClO- + H3O+
I  0.265                0        0
C  -x                    +x     +x
E  0.265-x          +x      +x
Now applying the equation of Ka, where Ka is given as 2.9 × 10-8.
Ka = ![\frac{[ClO-][H3O+]}{[HClO]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BClO-%5D%5BH3O%2B%5D%7D%7B%5BHClO%5D%7D)
 
2.9 × 10^-8 = ![\frac{[x] [x]}{[0.265-x]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Bx%5D%20%5Bx%5D%7D%7B%5B0.265-x%5D%7D)
 = 7.698 x
 = 7.698 x
x = 8.8 × 10-5 M 
The hydronium ion concentration is 8.8 × 10-5 M  in 0.265 M solution of HClO.
 
        
             
        
        
        
Of heating. Or when the lake is exposed to boil because of the temperature.
        
                    
             
        
        
        
Nitrogen (around 78%), Oxygen (around 21%), and Argon (around 1%).
Hope this helps :)