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Consider the following balance equation: 2Fe_2O_3 + 3S \to 3SO_2 + 4Fe. How many moles of sulfur...

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Consider the following balance equation: {eq}2Fe_2O_3 + 3S \to 3SO_2 + 4Fe {/eq}. How many moles of sulfur dioxide are made if 12 moles of iron III oxide are used?

Mole Ratios

A balanced chemical equation provides mole ratios that can be used in stoichiometry problems. The mole ratios come from the coefficients in front of each particle in the equation. For example, in the balanced chemical equation {eq}2Fe_2O_3 + 3S \to 3SO_2 + 4Fe {/eq}, the mole ratio of sulfur to iron is 3 moles or sulfur to 4 moles of iron, of 3:4. Ratios can always be reversed if it is more convenient. For example, you could write this mole ratio as 4 moles of iron to 3 moles of sulfur, or 4:3.

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This is a stoichiometry question and the strategy will be to use mole ratios from the balanced equation to solve it. The mole ratio between iron (III)...

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Mole-to-Mole Ratios and Calculations of a Chemical Equation

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Chapter 9 / Lesson 2
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Learn about the mole ratio. Understand the definition of mole ratio, how to find mole ratio in stoichiometry, and see examples of using mole ratio in problems.


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