Limiting Reactant and Excess Reactant Calculations
Chemistry ⇒ Stoichiometry and Chemical Calculations
Limiting Reactant and Excess Reactant Calculations starts at 11 and continues till grade 12.
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A mixture of 10.0 g of Ca and 10.0 g of O2 reacts to form CaO. The balanced equation is 2Ca + O2 → 2CaO. (Molar masses: Ca = 40.0 g/mol, O2 = 32.0 g/mol) Which is the limiting reactant?
A reaction between 8.0 g of CH4 and 32.0 g of O2 produces CO2 and H2O. Which is the limiting reactant? (Molar masses: CH4 = 16.0 g/mol, O2 = 32.0 g/mol)
A reaction has the equation 2A + B → 3C. If you have 4 mol of A and 1 mol of B, which is the limiting reactant?
A reaction has the equation 2Fe + 3S → Fe2S3. If you have 5.6 g of Fe and 8.0 g of S, which is the limiting reactant? (Molar masses: Fe = 56.0 g/mol, S = 32.0 g/mol)
A mixture of 10.0 g of Ca and 10.0 g of O2 reacts to form CaO. The balanced equation is 2Ca + O2 → 2CaO. (Molar masses: Ca = 40.0 g/mol, O2 = 32.0 g/mol) Which is the limiting reactant?
A reaction between 8.0 g of CH4 and 32.0 g of O2 produces CO2 and H2O. Which is the limiting reactant? (Molar masses: CH4 = 16.0 g/mol, O2 = 32.0 g/mol)
A reaction has the equation 2A + B → 3C. If you have 4 mol of A and 1 mol of B, which is the limiting reactant?
A reaction has the equation 2Fe + 3S → Fe2S3. If you have 5.6 g of Fe and 8.0 g of S, which is the limiting reactant? (Molar masses: Fe = 56.0 g/mol, S = 32.0 g/mol)
Which of the following best defines a limiting reactant in a chemical reaction? (1) The reactant that is present in the smallest amount by mass (2) The reactant that is completely consumed first (3) The reactant that is left over after the reaction (4) The reactant that has the highest molar mass
Which of the following is a correct method to identify the limiting reactant? (1) Compare the initial masses of reactants. (2) Compare the moles of each reactant to the required stoichiometric ratio. (3) Compare the molar masses of reactants. (4) Compare the volumes of reactants.
Which of the following is a correct statement about excess reactant? (1) It is always present in the smallest mass. (2) It is completely consumed in the reaction. (3) It is left over after the reaction is complete. (4) It determines the amount of product formed.
Which of the following is NOT a reason for determining the limiting reactant in a chemical reaction? (1) To calculate the theoretical yield (2) To determine the amount of excess reactant left (3) To identify the reactant with the highest molar mass (4) To predict the amount of product formed
Fill in the blank: After a reaction is complete, the reactant that is left over is called the __________ reactant.
Fill in the blank: The amount of product formed in a chemical reaction is determined by the __________ reactant.
Fill in the blank: The reactant that determines the theoretical yield of a product is called the __________ reactant.
Fill in the blank: The reactant that is completely consumed in a chemical reaction is called the __________ reactant.
True or False: In a chemical reaction, the reactant that is not completely used up is called the limiting reactant.
True or False: The excess reactant is always completely consumed in a chemical reaction.
True or False: The excess reactant is the one that determines the amount of product formed in a chemical reaction.
True or False: The excess reactant is the one that is present in a greater amount than required by the stoichiometric ratio.
