A piece of unknown metal has a width of 3.2cm, a length of 17.1cm and height of 4.6cm. Its mass is 1.4kg. Calculate the density of the metal. Express your answer in grams per cubic centimeter using two significant figures.
I have a test in the morning and really need to know how to do this and not just the answer. Hopefully you can help me... Thank you so much! :)
2007-02-07 15:04:36 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Easy! Density equals mass/volume. Figure out the volume by multiplying all the dimesions together, which would give you cubic centimeters. Take that number and set it aside for now. (251.712 cubic centimeters)
Convert the 1.4 kg into grams by multiplying by 1000 to give you 1400 grams.
Take the volume number you've calculated (the one in cubic centimeters) and divide it into 1400 grams. Your answer will be in grams per cubic centimeter. (5.56 g/cm3 or grams per cubic centimeter). Don't do your significant figures until the end of the equation.
2007-02-07 15:12:17 · answer #1 · answered by Paul BS 2 · 1⤊ 0⤋
Assuming it's a regular rectangular object, the volume is 3.2 x 17.1 x 4.6 or 251.7 cm^3 (250 cm^3 with only 2 sig. figs.).
1.4 kg = 1400 g, so density is 1400/250 or 5.6 g/cm^3.
2007-02-07 23:09:04 · answer #2 · answered by TheOnlyBeldin 7 · 1⤊ 0⤋