If the density of copper is 8.92 g/cm3, what is the thickness of ...

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If the density of copper is 8.92 g/cm3, what is the thickness of a copper foil that has a mass of
  0.223 g and measures 5.00 cm by 5.00 cm?
 
  A) 0.00100 cm
  B) 0.00500 cm
  C) 0.0100 cm
  D) 0.0796 cm
  E) 0.398 cm

Question 2

Which of the following scientists is credited with first arranging the elements into groups according to increasing atomic mass and repeating properties?
 
  A) Johann Dbereiner
  B) Dmitri Mendeleev
  C) H. G. J. Moseley
  D) J. A. R. Newlands
  E) none of the above

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Answer to Question 1

A)

Answer to Question 2

B

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