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Density 1

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a. What is the mass of 8.40 mL of mercury (Hg)?
b. What is the volume of 100 g of mercury?




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Find the value for the density of mercury in the Elements section. The formula for density is D=m/V.





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The density of mercury is 13.55 g/mL. The formula for density is D=m/V. D=density, m=mass and V=volume. You can also manipulate the formula algebraically so that m=DV or V=m/D.       (see Density in Chem 101 section)

a. D = m/V, m=DV     V=8.4 mL

                     D   = m/V  
                13.55 = m/8.4  
                    m   = (13.55)(8.4) 
                    m   =  113.82 g 

multiply 13.55 by 8.4 to solve for m

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b. D= m/V, V=m/D     m= 100 g          
                                      
                   D    = m/V
              13.55  = 100/V        
                  V    = 100/13.55                                                                                                       
                  V    = 7.38 ml

divide both sides by 100 to solve for V