2. A sample of gas contains 3.0 moles of gas A, 5.0 moles of gas B, and 7.0 moles of gas C. The total pressure of the mixture is 50.0atm, what is the partial pressure of each gas?

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