Posted by **julia** on Thursday, December 16, 2010 at 11:58am.

A 20.5 lb cast iron boat anchor displaces 1.33 qt of water when submerged. What is the density of the cast iron, in g/cm3?

1L=1.057 qt

1kg=2.205lb

1lb=453.6g

20.5lb X 453.6g/ 1lb = 9298.9g

1.33qt X 1L/1.057qt = 1.26L

1.26L X 1000cm3/1L = 1260cm3

9298.9g/1260cm3 = 7.38g/cm3

**now why my teacher answer is 7.39g/cm3???

- chem/plz/check work studying for a final -
**DrBob222**, Thursday, December 16, 2010 at 3:46pm
I think you rounded too soon. Just leave those numbers in the calculator.

20.5 x 453.6 = 9298.8 g (slight difference)

1.33 x 1000/1.057 = 1258.3 cc

9298.8/1248.3 = 7.39 g/cc.

- chem/thank you DrBob22 -
**julia**, Thursday, December 16, 2010 at 7:44pm
thank you so much....your good, I wish you be my teacher I be passing my class with no problem....

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