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.
 
        
             
        
        
        
We will use Arrehenius equation 
lnK = lnA  -( Ea / RT)
R = gas constant = 8.314 J / mol K 
T = temperature = 25 C = 298 K
A = frequency factor
ln A = ln (1.5×10 ^11) = 25.73 
Ea = activation energy = 56.9 kj/mol = 56900 J / mol 
lnK = 25.73 - (56900 / 8.314 X 298) = 2.76 
Taking antilog
K = 15.8 
 
        
             
        
        
        
Answer:
I think mixture
Explanation:
Mixture because it is a mixture of water and carbon