Chemistry
posted by william .
Gold is alloyed with other metals to increase its hardness in making jewelry.
Consider a piece of gold jewelry that weighs 9.85 g and has a colume of 0.675 cm cubed. The jewelry contains only gold and silver, which have densities of 19.3 g/cm cubed and 10.5 g/cm cubed, respectively. Assuming that the total colume of the jewelry is the sum of the columes of the gold and silver that it contains, calculate the percentage of gold (by mass) in the jewelry.
The answer is 61.5% Au, but I have no idea whatsoever how to find that answer...
massgold + massmetal= totalmass
you are given the total mass.
Volumegold + volumemetal= total volume
you are given the total volume
from the first...
massgold + massmetal= totalmass
densitygold*volumegold + densitymetal*volumemetal=9.85
So now you have two equations:
Volumegold + volumemetal=.675
19.3*volumegold + 10.5*volumemetal=9.85
solve for the volume of gold (any method you choose..I recommend substution)
Then, solve for the mass of gold from volume and density, then finally, percentage.
Repost if you get stuck. Nice problem
THANKS FOR YOUR HELP
Can I have your age AND EMAIL ADDRESS PLEASE. i REALLY WAS STUCK ON FUR SEALS.
tHANKS STEPH
Respond to this Question
Similar Questions

Adut education
The amount of gold jewelry and other products is measured in karats (K), where 24K represents pure gold. The mark 14K on a chain indicates that the ratio between the mass of the gold in the chain and the mass of the chain is 14:24 … 
math
The amount of gold jewelry and other products is measured in karats (K), where 24K represents pure gold. The mark 14K on a chain indicates that the ratio between the mass of the gold in the chain and the mass of the chain is . If a … 
Algebra
The purity of gold is measured in karats. Twentyfour karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16karat gold jewelry has a mass of 30 grams and another piece of 10karat gold jewelry has a mass of … 
Algebra 2
The purity of gold is measured in karats. Twentyfour karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16karat gld jewelry has a mass of 30 grams and another piece of 10karat gold jewelry has a mass of … 
chemistry
From the jewelry descriptions given, select the homogeneous mixture or solution. Answer? 
Chemistry
From the jewelry descriptions given, select the homogeneous mixture or solution. Answer? 
math
jewelry marked 14 karat gold is 14/24 pure gold. what is the percent 
Chemistry
Consider a piece of gold jewelry that weighs 9.81 g and has a volume of 0.670 cm3. The jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, respectively. Assuming that the total volume of the jewelry … 
Chemistry
The relative amount of gold in an alloy is commonly expressed in units of carats. Pure gold is 24 carats, and the percentage of gold in an alloy is given as a percentage of this value. For example, an alloy that is 50 percent gold … 
science
Consider a piece of gold jewelry that weighs 9.35 g and has a volume of 0.690 cm3 . The jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, respectively. If the total volume of the jewelry is the …