If the reacting amounts of both NH3 and F2 are increased, the total amount of energy released or absorbed will increase.

Question

If the reacting amounts of both NH3   and   F2 are increased, the total amount of energy released or absorbed will increase.

BlackTom AI · Accepted Answer

The statement concerns how the total energy change for the reaction NH3 + F2 depends on the amounts of NH3 and F2 present.

Consider the reaction's extent: if you have more of both reactants in stoichiometric proportion, more reaction can occur before limiting reagent stops it. In other words, increasing the available amounts increases the extent of reaction, and thus increases the total amount of energy released (if the reaction is exothermic) or the total energy absorbed (if endothermic), because the energy change scales with the number of moles that react.

Option analysis:
- If you increase both reactants while maintaining the proper stoichiometric ratio, you allow more moles to react, so the magnitude of the overall energy change grows. This supports the statement that the total energy released or absorbed will increase.
- One potential confusion is thinking energy change should stay fixed regardless of how much material is present; however, the thermodynamic potential change (enthalpy change) for a reaction is extensive and scales with the extent of reaction, which grows with more reactants available.
- Another misconception would be to assume energy per mole changes with amounts; while reaction conditions can influence rates, the standard enthalpy change per mole of reaction remains constant, so the total energy scales with how many moles react, not the energy per mole.

In summary, providing more reactants in the correct ratio permits a larger extent of reaction, resulting in a larger total energy change (whether release or absorption) overall.

202510 CHE 1405 01 Quiz 13 Energy of Reaction

If the reacting amounts of both NH3 and F2 are increased, the total amount of energy released or absorbed will increase.

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