# Natasha's mother gave her a solid gold necklace. She determines the chain has a mass of #7.6# #g#. The density of pure gold is #19.3# #g##/##cm^3#. About how much gold was used to make her necklace?

##### 1 Answer

#### Explanation:

Assuming that the neckless is made from **karat** gold, i. e. gold that is **density** of pure gold.

You know that gold has a density of **every milliliter** of gold has a mass of

This means that in order to get this mass of gold, you must use

#7.6 color(red)(cancel(color(black)("g"))) * overbrace("1 cm"^3/(19.3 color(red)(cancel(color(black)("g")))))^(color(blue)("the density of gold")) = color(green)(|bar(ul(color(white)(a/a)color(black)("0.39 cm"^3)color(white)(a/a)|)))#

The answer is rounded to two **sig figs**, the number of sig figs you have for the mass of the neckless.