How much energy (cal) is needed to vaporize 5.00 g of water to steam at 100.C? (The specific heat of water is 1.00 cal/g, the heat of fusion is 79.7 cal/g, and the heat of vaporization is 540 cal/g)..

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