AP-2024-Limiting Reactant Practice

Front

What is a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

How do you identify the limiting reactant in a reaction?

Back

To identify the limiting reactant, calculate the moles of each reactant and determine which one produces the least amount of product based on the stoichiometry of the reaction.

Front

What is the excess reactant?

Back

The excess reactant is the substance that remains after a chemical reaction has completed, as it was not completely consumed.

Front

How do you calculate the mass of the excess reactant?

Back

To calculate the mass of the excess reactant, first determine the amount of reactant that was consumed, then subtract this from the initial amount of the reactant.

Front

What is percent yield?

Back

Percent yield is a measure of the efficiency of a reaction, calculated as (actual yield / theoretical yield) x 100%.

Front

How do you calculate theoretical yield?

Back

Theoretical yield is calculated based on the stoichiometry of the balanced chemical equation and the amount of limiting reactant used.

Front

What is the balanced equation for the combustion of propane (C3H8)?

Back

C3H8 + 5 O2 -> 3 CO2 + 4 H2O.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass (moles = grams / molar mass).

Front

What is the molar mass of ammonia (NH3)?

Back

The molar mass of ammonia (NH3) is approximately 17.03 g/mol.

Front

What is the molar mass of oxygen (O2)?

Back

The molar mass of oxygen (O2) is approximately 32.00 g/mol.