Chemistry
posted by Mom .
A piece of metal alloy (a solution of metals) is made of gold and silver. It is 20% by mass silver. An irregularly shaped piece of this alloy contains 0.356 lb of gold. When the alloy is added to a graduated cylinder that contains 31.55 mL of alcohol, the level in the cylinder rises to 48.77 mL. If alcohol has a density of 0.890 g/cm³, what is the density of the alloy?

Chemistry 
bobpursley
convert the lbs of gold to grams. That represents eighty percent of the mass of the alloy sample, so the mass of the sample is massgold/.8
you know the volume of the sample(differences in the volumes of alcohol when submerged).
density alloy= massalloy/volume
Notice the density of the alcohol is given. That is a red herring.
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