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April 17, 2014

April 17, 2014

Posted by **Anonymous** on Sunday, October 2, 2011 at 12:45am.

20lbs/1 x 12inx12inx4in/1 x .454kg/1lb x 1g/1000kg x 1in^3/2.54cc=

20/1 x 576/1 x .454/1 x 1g/1000 x 1/2.54cc=

13.28g/cc

The right answer is supposed to be.96g/cc

Why is my answer incorrect?

- Chemistry -
**DrBob222**, Sunday, October 2, 2011 at 1:38amIt's too hard to follow all of the divisions etc in line formulas but your problem MAY be you didn't cube the 2.54 cm. The easy way to work the problem is

Convert 20 lbs to grams.

20 x 453.59 = ?grams.

Then Convert 1 ft to 12" and

12 x 2.54 cm = ?cm

4 x 2.54 cm = ?

12 x 2.54 cm = ?

12 x 12 x 4 x 2.54^3 = ?cc volume.

So 20*453.59/?cc volume = density and that gives me 0.96 g/cc.

- Chemistry -
**Anonymous**, Sunday, October 2, 2011 at 4:06pmThanks

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