Final answer:
There are approximately 6.022 x 10^23 water molecules in 1 mole of water.
Step-by-step explanation:
In 1 mole of water, there are approximately 6.022 x 1023 water molecules. The molar mass of water is approximately 18.02 grams. Therefore, to calculate the number of moles in 1 teaspoon of water, you need to know the mass of water in that teaspoon.