“Determine the partial pressure of the hydrogen collected in the gas collection tube.” I’m having trouble wuth this, I know I have to do this: partial pressure H2 = total pressure – vapor pressure of water. I know the vapor pressure of water, it’s 18.7 torr, but I don’t know how to know the total pressure. Just in case here’s the rest of the info I gathered: Volume of collected gas mL, 10 : Barometric pressure, 1.1 : Room temp Celsius, 21