There is 1 H atom: (1)(+1) = +1 The oxidation number of O is -2. There are 4 O atoms here: (4)(-2) = -8 So the oxidation state of Cl is +7. 
NOTE: The maximum positive oxidation number for chlorine is +7,<span> the same as its group number (VII).</span>
        
                    
             
        
        
        
Answer:
520ML and apparently I need to put more in this answer 
Explanation:
brainly.com
 
        
             
        
        
        
The pressure  of a sample  of a gas if the temperature  is changed  to 127  c  while  the volume  remains  constant   is calculated  using gay lussac law formula
that is P1/T1 = P2/V2
P1 = 100 torr
T1 = 27+273 = 300 k
T2 =127 +273 =400 k
P2=?
by  making P2 the subject of the formula
P2=T2P1/T1
=100  x 400/300 = 133.3 torr
        
             
        
        
        
C. Diffusion is not a phase change.