The reaction between ethyne (C2 H2) and hydrogen (H2) is illustrated in Figure 11.13 . The produ

step 1 The diagram in this question is showing the reaction between ethene, C2, H2, and hydrogen. These

The reaction between ethyne (C2 H2) and hydrogen (H2) is...

The reaction between ethyne $\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)$ and hydrogen $\left(\mathrm{H}_{2}\right)$ is illustrated in Figure $11.13 .$ The product is ethane $\left(\mathrm{C}_{2} \mathrm{H}_{6}\right) .$ Which is the limiting reactant? Which is the excess reactant? Explain.

The reaction between ethyne $\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)$ and hydrogen $\left(\mathrm{H}_{2}\right)$
is illustrated in Figure $11.13 .$ The product is ethane
$\left(\mathrm{C}_{2} \mathrm{H}_{6}\right) .$ Which is the limiting reactant? Which is the
excess reactant? Explain.

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Key Concepts

Balanced Chemical Equation

A balanced chemical equation shows the mole ratios between reactants and products and ensures that mass is conserved during the reaction. It is the foundational tool used for stoichiometric calculations, providing the necessary information to relate quantities of substances involved in the reaction.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It involves using the mole ratios from the balanced chemical equation to calculate the amounts of substances consumed and produced, which is crucial in determining limiting and excess reactants.

Limiting Reactant

The limiting reactant is the substance that is completely consumed first in a chemical reaction, thereby determining the maximum amount of product that can be formed. It controls the extent of the reaction because once it is used up, the reaction stops even if other reactants remain.

Excess Reactant

The excess reactant refers to the substance that is present in larger quantities than needed for the reaction according to stoichiometric calculations. Since it is not completely consumed, it remains after the reaction has proceeded to completion.

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