question_answer

A coating of cobalt that is \[0.005\text{ }cm\]thick is deposited on a plate, that is \[0.5\text{ }m\]in area. How many atoms of cobalt were deposited on the plate. While density of cobalt is \[9.5\text{ }gm/cm\]. (Atomic weight of cobalt = 59)

A)  \[24\times {{10}^{23}}\]         

B) \[~2.4\times {{10}^{23}}\]

C)   \[1.0\times {{10}^{23~}}\]

D)  \[0.024\times {{10}^{23}}\]