Answer:
The toxicant absorbtion can be reduced after exposure to the skin the surrounding clothing shoes or gloves should be removed or torn off than the part of the body which was exposured to the toxicant should be immediatly washed using clean running water for a while, with cold shower being the most recommended splashing method. In case of absorption for orally consumed chemicals should check on any remaining toxicant residue and be removed from the mouth. Vomiting should be induced to patients that are still conscious by providing them with liquids that can provoke vomiting. This will help in removing the toxicant in the intestinal and reduce their effect. Gastric lavage should then be done to induce diarrhea.  
Explanation:
 
        
             
        
        
        
Answer:
0.00840
Explanation:
The computation of the mole fraction is as follow:
As we know that 
Molar mass = Number of grams ÷ number of moles
Or 
number of moles = Number of grams ÷ molar mass
Given that 
Number of moles of CaI2 = 0.400
And, Molar mass of water = 18.0 g/mol
Now  Number of moles of water is 
= 850.0 g ÷ 18.0 g/mol 
= 47.22 mol
And, Total number of moles is 
= 0.400 + 47.22 
= 47.62
So, Molar fraction of CaI2 is 
= 0.400 ÷ 47.62 
= 0.00840