[jaded]

For some reason I'm blocking these problems. My instructor did one on the board that was similar, but with no explanation. It's a dimensional analysis solution.

If someone could start setting them up and explain why, it would really help me solve them. Thanks in advance. My own "notes" are below #1, indented.

1) A bracelet that has a volume of 15.40mL is made of an alloy that is 60.0% Gold by mass and has a density of 14.3g/mL. How many ounces (mass ounces) of Gold are in the bracelet?
--For example, it seems as though all you would have to do for this problem is take the volume and the density of the bracelet, solve for the mass and then take 60% of that number and convert grams to ounces. His method was solely using dimensional analysis though...so what am I missing?

2) A type of bronze is 80.0% by weight Copper and 20.0% Tin. The bronze has a density of 8.74 g/cubic cm. A sculptor is preparing to cast a bronze figure that requires 0.350L of bronze. How many mass ounces of Copper must be used to prepare the bronze to use in the figure?