"Rule of thumb" for the number of water molecules per cell

Value 2e+10 water molecules
Organism Bacteria Escherichia coli
Reference "Physical Biology of the Cell", Rob Phillips, Jane Kondev and Julie Theriot (2009). Page 34
Method According to Avogadro's number, molecular mass of water (18g/mole), E. coli cell mass 1 pg (BNID 101789) and E. coli water cell content of 70% (BNID 100044) N(H2O)˜[0.7×10^-12g/(18g/mole)]×6×10^23˜2×10^10 water molecules/cell
Entered by Ben Marks
ID 101851