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A flat, rectangular sheet of gold foil measures 20 cm by 20 cm and has a mass of 23.16 grams. If 1 cubic centimeter of gold has a mas of 19.3 grams, find the thickness of the gold foil.

 Jan 22, 2019
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As a  ratio:

 

(20 cm * 20 cm * x) / 23.16 gm   =   1 cm^3 /19.3 gm

Solve for 'x'

 

x = ( 1 * 23.16)/(19.3 * 20 * 20) = .003 cm thick

 Jan 22, 2019

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