Calculate the energy required to produce 7.00 mol ClO on the basis of the following balanced equation.
2Cl(g) + 7O(g) + 130 kcal 2ClO(g)

Question

Calculate the energy required to produce 7.00 mol ClO on the basis of the following balanced equation.
2Cl(g) + 7O(g) + 130 kcal  2ClO(g)

BlackTom AI · Accepted Answer

Restating the problem in my own words: We are given a balanced reaction where producing 2 ClO molecules requires 130 kcal of energy. The task is to find the energy needed to produce 7.00 mol of ClO.
Option A: 7.00 kcal. This would imply an energy per mole that is far smaller than the given energy per 2 moles. Since the reaction energy is tied to producing ClO, this value does not align with the stoichiometry or the provided 130 kcal for 2 moles, so it is incorrect.
Option B: 65 kcal. This is exactly half of 130 kcal, which might tempt someone to divide by 2, perhaps thinking in terms of per-mole energy. However, the 130 kcal corresponds to the production of 2 moles of ClO, not 1 mole. Therefore halving it would only be appropriate if we produced 1 mole of ClO, not 7 moles, making this option inaccurate for the given quantity.
Option C: 130 kcal. This value represents the energy for producing 2 moles of ClO, not the 7.00 moles specified. If we produced 2 moles, 130 kcal would be correct, but for 7.00 moles, the energy required would scale with the amount of product, so this option underestimates the needed energy.
Option D: 455 kcal. This matches the proper scaling: the reaction energy is 130 kcal per 2 moles of ClO. First find the factor: 7.00 mol ClO ÷ 2 mol = 3.5. Then multiply 130 kcal by 3.5 to get 455 kcal. This correctly accounts for the stoichiometry and the amount of product requested.
In summary, the key is recognizing the 130 kcal corresponds to producing 2 mol of ClO, and then scaling by 7.00/2 = 3.5, yielding 130 × 3.5 = 455 kcal. The other options fail because they either ignore the per-2-moles energy, misapply scaling, or attempt to apply energy per mole incorrectly.

Calculate the energy required to produce 7.00 mol ClO on the basis of the following balanced equation. 2Cl(g) + 7O(g) + 130 kcal 2ClO(g)单项选择题

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