a) Consider a piece of gold jewelry that weighs 9.85g and has a volume of 0.675cm^3. The jewelry contains only gold and silver which have densities of 19.3g/cm^3 and 10.5g/cm^3. Assuming that the total volume of the jewelry is the sum if the volumes of the gold and silver that it contains, calculate the percentage of gold (by mass) of the jewelry.

b)The relative amount of gold in an alloy is commonly expressed in units of karats. Pure gold is 24 karats,and the percentage of gold in an alloy is given as the percentage of this value. State the purity of the gold jewelry in karats.

Question

a) Consider a piece of gold jewelry that weighs 9.85g and has a volume of 0.675cm^3. The jewelry contains only gold and silver which have densities of 19.3g/cm^3 and 10.5g/cm^3. Assuming that the total volume of the jewelry is the sum if the volumes of the gold and silver that it contains, calculate the percentage of gold (by mass) of the jewelry.

b)The relative amount of gold in an alloy is commonly expressed in units of karats. Pure gold is 24 karats,and the percentage of gold in an alloy is given as the percentage of this value.  State the purity of the gold jewelry in karats.

anonymous · Answer

I can probably do b, I just need a

anonymous · Answer

total volume is 0.675cm^3
volume of gold is x
volume of silver is y

mass is 9.85g
how do you find mass if you're given volume and density?

anonymous · Answer

2 equations 2 unknowns