| Themes > Science > Chemistry > Inorganic Chemistry > Gas Laws > More Gas Laws > Gas Stoichiometry |
Standard temperature and pressure (abbreviated STP) is defined as 0 C and 1 atmosphere. At these conditions the volume of 1 mole of any gas is approximately 22.42 L. In other words, one mole of oxygen gas will take up about 22 liters, one mole of nitrogen gas will take up about 22 liters, and one mole of helium gas will take up (you guessed it) about 22 liters. Another important equation that is used to determine molecular weight is: molecular weight = dRT/P, where d (density) is in the units grams per liter. So if you have the density of a gas, the pressure it's under, and the temperature, you can calculate its molecular weight. |
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