Assume a perfect sphere of Al has a radius of 0.700 mm. How many Al atoms are in the sphere?

The density of Al is 2.70 g/cm^{3}. Volume of a sphere = 4/3 $\mathrm{\pi}$ r^{3}

a. 8.66 x 10^{19}

b. 8.66 x 10^{20}

c. 6.30 x 10^{22}

d. 6.30 x 10^{25}

e. 8.66 x 10^{25}

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