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Problem: Consider the reaction:4 HCl(g) + O2(g) → 2 H2O(g) + 2 Cl2(g)Each molecular diagrams represents an initial mixture of the reactants.Which mixture produces the greatest amount of products?

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a.

7 mol HCl×2 mol H2O4 mol H2O = 3.5 mol H2O

1 mol O2 ×1 mol O22 mol H2O = 0.5 mol H2O → limiting


b.

5 mol HCl×2 mol H2O4 mol H2O = 2.5 mol H2O

3 mol O2 ×1 mol O22 mol H2O = 1.5 mol H2O → limiting


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Problem Details
Consider the reaction:

4 HCl(g) + O2(g) → 2 H2O(g) + 2 Cl2(g)

Each molecular diagrams represents an initial mixture of the reactants.

Three space-filling molecular diagrams labeled a, b, and c. Diagram a is a collection of seven molecules composed of a green and smaller white sphere combined, and one molecule composed of two red spheres combined. Diagram b is a collection of six molecules composed of a green and smaller white sphere combined, and three molecules composed of two red spheres combined. Diagram c is a collection of four molecules composed of a green and smaller white sphere combined, and five molecules composed of two red spheres combined.

Which mixture produces the greatest amount of products?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Limiting Reagent concept. If you need more Limiting Reagent practice, you can also practice Limiting Reagent practice problems.