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October 22, 2014

October 22, 2014

Posted by **Lisa** on Saturday, February 2, 2013 at 4:27pm.

- Chemistry -
**DrBob222**, Saturday, February 2, 2013 at 4:49pmYou didn't provide the density.

20.02 what?

2.573 what?

We just went through this you first post. You should catch on soon that these problems don't mean a thing without units.

If I weigh 150 WHAT that could be 150 pounds, 150 kg, 150 tons, 150 grams.

- Chemistry -
**Lisa**, Saturday, February 2, 2013 at 5:05pmwhen I was copying and pasting the problem the units and numbers did not transfer... I completely understand that you need these units

- Chemistry -
**Lisa**, Saturday, February 2, 2013 at 5:07pmThe density of aluminum is 2.70 g/cm^3. A square piece of aluminum foil, 20.02 on a side is found to weigh 2.573g. What is the thickness of the foil, in millimeters?

- Chemistry -
**Lisa**, Saturday, February 2, 2013 at 5:08pm20.02cm*

- Chemistry -
**DrBob222**, Saturday, February 2, 2013 at 5:15pmdensity = mass/volume. You have the mass and density, solve for volume, then substitute volume into the below equation and solve for thickness.

volume = length x width x thickness.

v = 20.02 x 20.02 x thickness.

- Chemistry -
**Lisa**, Saturday, February 2, 2013 at 5:24pmthank you

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