Avogadro's Law
Equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
\( V \propto n \)
Volume Ratios in Reactions
Because volume ∝ moles (for gases), the coefficients in a balanced equation also give the volume ratio.
\( 2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \)
2 volumes of H₂ react with 1 volume of O₂.
Molar
Volume at STP
22.7
dm³ mol⁻¹
STP = 273 K
| 100 kPa