Stoichiometry Quiz

Stoichiometry

Definition Stoichiometry is the study of the quantitative relationships between reactants and products in chemical reactions.

Key Concepts

Mole Ratio

• The ratio of the number of moles of one substance to the number of moles of another substance in a chemical reaction.
• Used to determine the amount of reactants required or products formed in a reaction.

Limiting Reagent

• The reactant that is completely consumed in a reaction, limiting the amount of product formed.
• Identified by calculating the number of moles of each reactant and determining which one is used up first.

Excess Reagent

• The reactant that is not completely consumed in a reaction, remaining in excess after the reaction is complete.

Percent Yield

• The percentage of the theoretical yield that is actually obtained in a reaction.
• Calculated by dividing the actual yield by the theoretical yield and multiplying by 100.

Stoichiometric Calculations

Mole-Mass Conversions

• Moles to mass: multiply moles by molar mass
• Mass to moles: divide mass by molar mass

Empirical Formula Calculations

• Determine the mole ratio of elements in a compound
• Use the mole ratio to write the empirical formula

Reaction Stoichiometry

• Calculate the number of moles of reactants required or products formed
• Use mole ratios to determine the amount of reactants required or products formed

Importance of Stoichiometry

• Essential in chemistry and chemical engineering for predicting reaction outcomes and optimizing reaction conditions.
• Used in a wide range of applications, including pharmaceuticals, materials science, and environmental science.

Stoichiometry

Definition

• Study of quantitative relationships between reactants and products in chemical reactions.

Key Concepts

Mole Ratio

• Ratio of moles of one substance to moles of another in a chemical reaction.
• Used to determine reactants required or products formed in a reaction.

Limiting Reagent

• Reactant completely consumed in a reaction, limiting product formed.
• Identified by calculating moles of each reactant and determining which one is used up first.

Excess Reagent

• Reactant not completely consumed in a reaction, remaining in excess after reaction.

Percent Yield

• Percentage of theoretical yield actually obtained in a reaction.
• Calculated by dividing actual yield by theoretical yield and multiplying by 100.

Stoichiometric Calculations

Mole-Mass Conversions

• Moles to mass: multiply moles by molar mass.
• Mass to moles: divide mass by molar mass.

Empirical Formula Calculations

• Determine mole ratio of elements in a compound.
• Use mole ratio to write empirical formula.

Reaction Stoichiometry

• Calculate number of moles of reactants required or products formed.
• Use mole ratios to determine amount of reactants required or products formed.

Importance of Stoichiometry

• Essential in chemistry and chemical engineering for predicting reaction outcomes and optimizing reaction conditions.
• Used in applications such as pharmaceuticals, materials science, and environmental science.