Question

what is the volume in dm3 of 3 moles of oxygen at stp​

Answer 1

Answer:

Standard Temperature and Pressure conditions imply a temperature of 273.15 K and a pressure of 1 atm.

When these conditons are met, 1 mole of any ideal gas occupies exactly 22.4 L. Keep in mind that ideal gas particles are assumed to have no volume of their own, that's why, for example, at STP 1 mole of helium gas will occupy the same volume as, say, 1 mole of chlorine gas.