a. The unit cell is the smallest group of atom which have overall symmetry of a crystal, and from which is the entire letters can be buled built up by repetition in 3 dimensions.
b. The volume(v) of the unit cell is equal to the cell edge length (a)cubed.
c. density of polonium is 9.32g/cm3.
Chemical because the propane has stored chemical energy which is being released and a by-product of that propane is heat or themal energy.
173.99cm multiply 68.5 x 2.54 always use that number when converting inches to cm
