Standard conditions of temperature and pressure for a thermochemical equation are 25°c and 101 kpa 25°c and 22.4 kpa 0°c and 0 kpa 0°c and 101 kpa

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

How can liquids be seperated by density a the liquids are absorbed onto a paper b the liquids are turned into seperate vapors c the liquids are collected as they evaporate d the liquids are allowed to seperate into layers