# 3-B - Stoichiometry Limiting Reagents: The extent to which...

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1 Stoichiometry Limiting Reagents: The extent to which a reaction takes place depends on the reactant that is present in limiting amounts— the limiting reagent .

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2 Stoichiometry In this figure, ethylene oxide is the limiting reagent.
3 Stoichiometry Limiting Reagent: The reactant that governs the maximum amount of product that can be formed. Ex: Combustion of Octane C 8 H 18 + O 2 → CO 2 + H 2 O If 100 g octane and 150 g oxygen are supplied for combustion, which is the limiting reagent?

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4 Stoichiometry Limiting Reagent: The reactant that governs the maximum amount of product that can be formed. Ex: Combustion of Octane 2 C 8 H 18 + 25 O 2 → 16 CO 2 + 18 H 2 O If 100 g octane and 150 g oxygen are supplied for combustion, which is the limiting reagent?
5 Stoichiometry 2 C 8 H 18 + 25 O 2 → 16 CO 2 + 18 H 2 O Moles octane: 100 g x mole/114.22 g = 0.876 moles Moles oxygen: 150 g x mole/32.00 g = 4.69 moles Moles oxygen needed: 0.876 x 25/2 = 11.0 moles Moles octane needed: 4.69 x 2/25 = 0.375 moles

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6 Stoichiometry 2 C 8 H 18 + 25 O 2 → 16 CO 2 + 18 H 2 O 0.976 moles octane available and 0.375 moles needed 4.69 moles oxygen available and 11.0 moles needed So OXYGEN is the limiting reagent We won’t burn all of the octane
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## 3-B - Stoichiometry Limiting Reagents: The extent to which...

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