Density
Density  =  Mass / Volume

D = M
       V

Solve:
1.
 49 g of an object has a volume of 28 ml.  Determine the density.                    
2.
 Lead has a density of 11.4 g/ml.  Determine the mass if the volume is 45.8 ml.
3.
 7.250 g of  methane has a density of .6650 g/cm3.  Determine the volume of gas in liters.
4.
 495 dg of an object has a density of 3.8 cl.  Determine the density.

Answers:
1.
 D = M/V
D = 49 g/ 28 ml                                                                                  
D = 1.8 g/ml
2.
 D = M/V
M = D x V
M = (11.4 g/ml)(45.8 ml)
M = 522 g
3.
 D = M/V
V = M/D
V = 7.250 g/.6650 g/cm3
V = 10.90 cm3  =  .01090 L     [Remember:  1 ml = 1 cm3]
4.
 D = M/V
D = 495 dg/3.8 cl
D = 49.5 g/38 ml = 1.3 g/ml