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?
Assuming that the neckless is made from
You know that gold has a density 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.