Question: how many molecules of water are there in 10 lbs of water?
Answer: The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules. The number of atoms is 3 times larger because each molecule has three atoms, so there are 1.0038*1026 atoms in a liter of water. Now we know enough to answer your question. A typical human head weighs about 10 - 12 pounds.