<span>let x=gallons of current mixture to be drained
and replaced with pure antifreeze.
4-x=gallons of current mixture remaining in the car.</span>
<span>
0.15(4-x)+1.00x=0.50 x 4
0.6-.15x+x=2
0.85x=1.4
x=1.4/0.85 =1.65 gal
Thus, 1.65 gallons of current mixture to be drained and replaced with pure
antifreeze.</span>
 
        
             
        
        
        
Answer:
Diameter He = 0,1 nm.
Explanation:
Km to nm:
⇒ Diameter He = 1.0 E-13 Km * ( 1000 m / Km ) * (  1 E9 nm / m )
⇒ Diameter He = 0.1 nm
 
        
                    
             
        
        
        
Answer:
Here:
Explanation:
To familiarize students with experimental apparatus, the scientific method, and methods of data analysis so that they will have some idea of the inductive process by which the ideas were originated. To teach how to make careful experimental observations and how to think about and draw conclusions from such data.
 
        
             
        
        
        
0.012moldm⁻³
Explanation:
Given parameters: 
Mass of AgNO₃  = 1000mg 
Volume of water = 500mL 
Unknown: 
Molarity of solution  = ? 
Solution: 
The molarity of a solution is the number of moles of a solute dissolved in volume of solvent. 
  Molarity = 
  
Number of moles of AgNO₃  = ? 
    Number of moles = 
Molar mass of AgNO₃ = 108 + 14 + 3(16) = 170g/mol
    convert mass to g; 
       1000mg = 1g 
  Number of moles  =  = 0.00588moles
  = 0.00588moles 
    convert the given volume to dm³; 
        1000mL  = 1dm³; 
         500mL = 0.5dm³
Now solve; 
   Molarity =  = 0.012moldm⁻³
  = 0.012moldm⁻³
learn more: 
Molarity brainly.com/question/9324116
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