How many moles are equal to a 0.25g sample of chromium?

Summarize possible ways in which phases of matter could combine to form a solution.

Which description best characterizes the motion of particles in a solid?

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