Homework Help: math/chem

Posted by echem on Thursday, April 8, 2010 at 10:24pm.

If a cube with edges of 1.000 cm weighs 25.68 g, what would the mass of a cube
of the same material with sides 2.66 cm in length be?
I got 68.301 but it was wrong...
i basically made a ratio 25.68 g/1cm and did 2.66cm x 25.68 (dimensional analysis)
This should be very simple but I'm having so much trouble with it. Please help, Thank You!

math/chem - Reiny, Thursday, April 8, 2010 at 10:48pm
volume of 2 similar cubes is proportional to the cube of their sides

x/25.68 = 2.66^3/1^3
x = 483.32
math/chem - echem, Thursday, April 8, 2010 at 11:16pm
Thank You!

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