<span>Scientists ignore the forces of attraction between particles in a gas under ordinary conditions</span><span> because the particles in a gas are apart and moving fast, rather than clustered and moving slow, therefore the forces of attraction are too weak to have a visible effect.</span>
        
             
        
        
        
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Answer:
a.  0.119mol Kr
Explanation:
To solve this problem, we must understand that; 
      Mass  = number of moles x molar mass 
Molar mass of Kr  = 83.3g/mol
                         Ar = 40g/mol
                         He = 4g/mol
                         Ne = 20.18g/mol
a0.119 mol Kr               mass  = 0.119 x 83.3 = 9.9g
b 0.400 mol Ar             mass  = 0.4 x 40  = 16g 
C 1.25 mol He               mass  = 1.25 x 4  = 5g 
d 2.02 mol Ne              mass  = 2.02 x 20.18  = 40.8
Krypton is the answer
 
        
             
        
        
        
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