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Consider the following chemical equations: 2NO₂(g) → 2NO(g) + O₂(g) ΔHf = +14 kJ mol⁻¹ NO(g) + CO(g) → CO₂(g) + NO(g) ΔHf = -226 kJ mol⁻¹ 2NO₂(g) → N₂O₄(g) ΔHf = -57 kJ mol⁻¹ N₂(g) + O₂(g) → 2NO(g) ΔHf = +181 kJ mol⁻¹ Which one of the following graphs is consistent with the chemical equations above? - VCE - SSCE Chemistry - Question 18 - 2021 - Paper 1
Question 18
Consider the following chemical equations: 2NO₂(g) → 2NO(g) + O₂(g) ΔHf = +14 kJ mol⁻¹ NO(g) + CO(g) → CO₂(g) + NO(g) ΔHf = -226 kJ mol⁻¹ 2NO₂(g) → N₂O₄(g) ΔHf =... show full transcript
Worked Solution & Example Answer:Consider the following chemical equations: 2NO₂(g) → 2NO(g) + O₂(g) ΔHf = +14 kJ mol⁻¹ NO(g) + CO(g) → CO₂(g) + NO(g) ΔHf = -226 kJ mol⁻¹ 2NO₂(g) → N₂O₄(g) ΔHf = -57 kJ mol⁻¹ N₂(g) + O₂(g) → 2NO(g) ΔHf = +181 kJ mol⁻¹ Which one of the following graphs is consistent with the chemical equations above? - VCE - SSCE Chemistry - Question 18 - 2021 - Paper 1
Step 1
Step 2
Analyze the Graphs
Answer
The appropriate graph should depict changes in enthalpy (kJ mol⁻¹) through the progress of the reaction. For exothermic reactions, we expect a drop in enthalpy, starting from reactants and proceeding towards products. The energy peak suggests an activation energy, leading to the products being at a lower enthalpy compared to the reactants.
Step 3
Determine Consistency with Given Equations
Answer
Given the details of the reactions, the graph must reflect the energy changes indicated by the ΔH values. The graph corresponding to option C must exhibit the correct energy profile showing a drop due to exothermic reactions, consistent with the provided chemical equations.
Step 4