Answer:
For each scenario as following: 
A. 3 Potential deaths by chlorine exposure
B. 1 Potential deaths by chlorine exposure
C. 3 Potential deaths by chlorine exposure
Explanation:
According to Freitag, 1941 Chlorine exposure can be lethal at the concentration of 34-51 ppm in a time of 1h-1.5h. The answers are based on his reference.
 
        
             
        
        
        
Answer:
1 mole of platinum 
Explanation:
To obtain the number of mole(s) of platinum present, we need to determine the empirical formula for the compound. 
The empirical formula for the compound can be obtained as follow:
Platinum (Pt) = 117.4 g
Carbon (C) = 28.91 g
Nitrogen (N) = 33.71 g
Divide by their molar mass 
Pt = 117.4 / 195 = 0.602
C = 28.91 / 12 = 2.409
N = 33.71 / 14 = 2.408
Divide by the smallest 
Pt = 0.602 / 0.602 = 1
C = 2.409 / 0.602 = 4
N = 2.408 / 0.602 = 4
The empirical formula for the compound is PtC₄N₄ => Pt(CN)₄
From the formula of the compound (i.e Pt(CN)₄), we can see clearly that the compound contains 1 mole of platinum. 
 
        
             
        
        
        
It means <span>a substance formed by chemical union of 2 or more elements or ingredients in definite proportion by weight.</span>
        
             
        
        
        
Bottle 1 is a compound bottle 2 is element bottle 3 is a element bottle 4 is a element