The aluminum in a package containing 64 ft^2 of kitchen foil weighs approximately 12 ounces. Aluminum has a density of 2.70 g/cm^3 . What is the approximate thickness of the aluminum foil in millimeters? (1 ounce = 28.4g)

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This problem can look somewhat daunting at first glance, but just start with the information that you have and use it to fill in equations that you have already likely been told in class. I would start with figuring out the total mass.

You have a 12 ounce package. 1 ounce = 28.4 grams. Multiply 28.4 by 12. This means that the total mass of aluminum that you have is 340.8 grams.

You have also been given the density. If...

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