Best Answer

500 trillion = 500x10^12 molecules = 5x10^14 molecules

5x10^14 molecules x 1 mole/6.02x10^23 molecules x 18 gram/mole = 15x 10^-9 grams = 1.5x10^-8 g

This is obviously a very small amount of water.

Q: What is the mass of 500 trillion molecules of water?

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