Hello I need help with number 3. 1. An unknown mass of gold displaces 89.1 mL of water in a container. What is the mass of the gold.
-My answer is 1719.63g
2. Using identical conditions, what volume of water will the identical mass of silver displace?
-My answer is 164.2mL
3. Using an identical system, a supposedly gold crown with the same mass is measured and found to displace 138.4 mL. What percent gold is it really? (This is an algebra problem that requires two equations with two unknowns and the answers of questions 1 and 2.)

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

d

explanation:

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.