Gas stoichiometry is the study of the relative amounts of reactants and products in reactions that involve gases. EXAMPLE Solution Step 1. Write the balanced chemical equation. 4NH₃(g) + 7O₂(g) → 4NO₂(g) + 6H₂O(l) Step 2. Convert mass of NH₃ → moles of NH₃ → moles of NO₂. 100 g NH₃ × #(1"mol NH"_3)/(17.03"g NH"_3) × (4"mol NO"_2)/(4"mol NH"_3)# = 5.872 mol NH₃ (3 significant figures + Step 3. Use the Ideal Gas Law to calculate the volume of NO₂. #PV = nRT# #V = (nRT)/P = (5.872"mol" × 8.314"kPa·L·K"^-1"mol"^-1 × 273"K")/(100 "kPa")# = 133 L
|