Multiple Choice
When 50.0 mL of 0.100 M AgNO3 is combined with 50.0 mL of 0.100 M HCl in a container, how many moles of AgCl are produced?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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The reaction NO2(g) + CO(g) → NO(g) + CO2(g) occurs in one step with an activation energy of 132 kJ/mol and a ΔE of -226 kJ/mol. Is this reaction endothermic or exothermic?
A
Exothermic
B
Endothermic
Verified step by step guidance1
Understand the terms: Activation energy is the energy required to initiate a reaction, while ΔE (change in energy) is the difference in energy between the reactants and products.
Identify the given values: The activation energy is 132 kJ/mol, and ΔE is -226 kJ/mol.
Determine the sign of ΔE: A negative ΔE indicates that the products have lower energy than the reactants, meaning energy is released during the reaction.
Classify the reaction: Since energy is released (ΔE is negative), the reaction is exothermic.
Conclude: An exothermic reaction releases energy to the surroundings, which aligns with the negative ΔE value provided.
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