Morning to whoever is reading this! For reference, I'm doing college chemistry 1301, A Carbonate Analysis: Molar Volume of Carbon Dioxide. I'm trying to find the vapor pressure of H2O at 21 degrees C. Other information includes: Barometric pressure is 756 torr. Volume of volume in CO2 collecting cylinder is 50 ml, with the final being 21 ml. If you can't find the answer based on these results, then you can kindly explain how to find Vapor Pressure, I'll work on it.