Homework Help: Chemistry

Posted by Jennifer on Monday, September 5, 2011 at 1:42am.

In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are 2.80 inches in diameter and have a mass of 2.00g of silicon. How thick (mm) is each wafer if silicon has a density of 2.33g/cm^3? (The volume of a cylinder is V=(pi)r^{2}h.)

Chemistry - DrBob222, Monday, September 5, 2011 at 1:56am
Convert 2.80 inches to cm and take half (to find the radius), then V = pi*r^2*h.but pi*r^2 is the area; therefore, V = area*h. You can find the area from pi*r^2.
mass = volume x density. Substitute mass and density to find volume, Then substitute area into V = area*h and solve for h. That will give you thickness in cm.

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