Determine the mass of one molecule of:

a. O_{3}

b. NO

c. NH_{3}

d. U^{235}F_{6}

e. U^{238}F_{6}

Hint: on (d) and (e), you may wish to consult a "Handbook of Chemistry and Physics" for the exact weights of the U-235 and U-238 isotopes.

Can you swim in a billion billion (1.00 x 10^{18}) molecules of water? What mass does this represent?

How many molecules of oxygen (O_{2}) would be required to produce one drop (0.010 g) of water?

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