Question: how many water molecules are in a teaspoon?
Answer: A teaspoon of water (about 5 mL) contains 2×10 23 water molecules, but each water molecule is comprised of 3 atoms: two hydrogen and one oxygen. Moreover, if you'd laid down end to end each water molecule from a teaspoon full you'd end up with a length of 50 billion km or 10 times the width of our solar system.