<h3><u>Answer;</u></h3>
F, Br, l
<h3><u>Explanation;</u></h3>
- Astatine is a member of the halogen family, elements in Group 17 (VIIA) of the periodic table.
- It is a highly radioactive element and it is the heaviest known halogen. Astatine is similar to the elements above it in Group 17 (VIIA) of the periodic table, especially iodine.
- 
One property of iodine is that it tends to collect in the thyroid gland
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The solubility of nitrogen in water at 25 °C= 4.88 x 10⁻⁴ mol/L
<h3>Further explanation</h3>
Given
 78% Nitrogen by volume
Required
The solubility of nitrogen in water
Solution
Henry's Law states that the solubility of a gas is proportional to its partial pressure  
Can be formulated  
S = kH. P.  
S = gas solubility, mol / L  
kH = Henry constant, mol / L.atm  
P = partial gas pressure  
In the standard 25 C state, the air pressure is considered to be 1 atm, so the partial pressure of N₂ -nitrogen becomes:
Vn / Vtot = Pn / Ptot
78/100 = Pn / 1
Pn = 0.78 atm
Henry constant for N₂ at 25 °c = 1600 atm/mol.L=6.25.10⁻⁴ mol/L.atm
The solubility :

 
        
             
        
        
        
Answer:
0.00011 JK. 
The process does NOT violate the second law of thermodynamics
Explanation:
The following parameters are given which are going to help in solving for the change in entropy of the system. The term "entropy'' simply means the degree of disorderliness of a system. 
=> The temperature of container A = 305 K, the temperature of container B = 295 K and the amount of heat generated when the containers are placed in contact with each other = 1. 1 J. 
The change in entropy of the hot container = -(1/305) = - 0.00328 J/K.
The change in entropy of the cold container = 1/295 = 0.00339 J/K. 
Therefore, the change in the entropy of the system = - 0.00328 J/K + 0.00339 J/K = 0.00011 JK. 
Note that the change in entropy of the system gives a positive value. Hence, this process does not violate the second law of thermodynamics. 
The process does NOT violate the second law of thermodynamics.