Sterling silver is a solid solution of silver and copper. if a piece of a sterling silver necklace has a mass of 105.0g and a volume of 10.12 ml, calculate the mass percent of copper in the piece of necklace. assume that the volume of silver present plus the volume of copper present equals the total volume.

Density for Cu: 8.96 g/ml 
Density for Ag: 10.5g/ml

First set up an equation: mass = density * volume 

8.96 * x + 10.5* (10.12 - x) = 105.0 

The density of the Cu (8.96) times x (the amount of copper) added to the density of Ag (10.5) times voume of silver (10.12 - the amount of copper) should equal the total weight. 

Solving for x:

x = 0.818 mL 

So 
mass of copper = 8.96 * .818 = 7.33 
mass percent of copper = 7.33/105 * 100% = 6.98%

False because saturated fatty acids contain only single bond

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom