Copper has two isotopes, copper-63 and copper-65. The relative abun-
dance of copper-63 is 69.1% and copper-65, 30.9%. Calculate the
average atomic mass of copper.

63.55 amu

Explanation:

(0.692 * 62.930) + (0.308 * 64.928) = 63.55 amu

Copper has two naturally occurring

isotopes: copper-63 (69.17%) and

copper-65 (30.83%).

Calculate the average atomic mass of

copper if the relative masses of the

isotope are copper 63 (62.93 amu)

and copper-65 (64.93 amu).

Cu-63 (0.6917 x 62.93 amu)

Cu-65 + (0.3083 x 64.93 amu)

Avg. mass = 63.55 amu

b

explanation:

mitosis

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error