On 9/6/2003 6:37:46 AM, Invincible wrote:
>Gold is alloyed with other
>metals to increase its
>hardness in making jewelry.
>Consider a piece of gold
>jewelry that has a mass of
>9.85g and has a volume of
>0.675cc. The jewelry contains
>only gold and silver that have
>densities 19.3g/cc and
>10.5g/cc respectively.
>Assuming that the total volume
>of the jewelry is the sum of
>the volumes of the gold and
>silver that it contains,
>calculate the percent of gold
>( by mass) in the jewelry.
>
>How do I solve this problem?
You have the total volume, call it V, and you know that a portion, call it p, is gold and the remainder V-p, is silver. So,
dens_{gold}*p+(V-p)*dens_{silver}=total_mass
solve for p, then calculate the total mass of gold, then calculate the percentage of the total mass.
TTFN,
Eden