Chapter 5, Problem 68AP

Evaluate this statement: ‘One cup of water has more molecules than there are cups of water
in all of Earth’s oceans” (1 cup = 236 mL = 236 cm³). For the volume of the oceans, use
3.50 $\times$ 10⁸cubic miles.

68. If a Neanderthal excreted 500 mL of urine into the ocean 50,000 years ago. how many molecules in 500 mL of water you drink today are from that urine? Refer to Problem 67, and assume complete mixing of the waters of Earth over 50,000 years.