Decomposition of 36.54 g of a pure solid compound produced 4.06 g of nitrogen gas, 10.44 g of water and a solid metal oxide. The metal oxide is found to contain 68.42 percent of chromium. What is the empirical formula of the metal oxide

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth