Multiple Choice
In stoichiometry, is every chemical reaction classified as either endothermic or exothermic based on the heat of reaction?
3. Chemical Reactions
Stoichiometry
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Given the balanced equation N2(g) + 3 H2(g) → 2 NH3(g), what is the rate of reaction with respect to [NH3] if the rate of disappearance of H2 is 0.6 mol/L·s?
A
0.4 mol/L·s
B
0.6 mol/L·s
C
0.8 mol/L·s
D
0.2 mol/L·s
Verified step by step guidance1
Identify the balanced chemical equation: N₂(g) + 3 H₂(g) → 2 NH₃(g). This equation shows the stoichiometric relationship between the reactants and products.
Understand the concept of reaction rates: The rate of reaction is related to the change in concentration of a reactant or product over time. For this problem, we are given the rate of disappearance of H₂ and need to find the rate of formation of NH₃.
Use the stoichiometry of the balanced equation to relate the rates: According to the equation, 3 moles of H₂ produce 2 moles of NH₃. Therefore, the rate of formation of NH₃ is (2/3) times the rate of disappearance of H₂.
Apply the given rate of disappearance of H₂: The rate of disappearance of H₂ is given as 0.6 mol/L·s. Use the stoichiometric ratio to find the rate of formation of NH₃: Rate of NH₃ = (2/3) × Rate of H₂.
Calculate the rate of formation of NH₃ using the stoichiometric ratio: Substitute the given rate of H₂ into the equation to find the rate of NH₃. This will give you the rate of reaction with respect to [NH₃].
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