Stoichiometry, % yield, Limiting Reactants

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

Define limiting reactant.

Back

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

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 moles from molarity and volume?

Back

Moles = Molarity (M) x Volume (L).

Front

What is the balanced equation for the reaction of magnesium with hydrochloric acid?

Back

Mg + 2HCl -> MgCl2 + H2.

Front

How do you determine the limiting reactant in a reaction?

Back

To determine the limiting reactant, calculate the moles of each reactant and compare the mole ratio from the balanced equation.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, based on stoichiometric calculations.

Front

If 6.00 g of HCl reacts with 5.00 g of Mg, how do you find the limiting reactant?

Back

Convert grams to moles for both reactants, then use the stoichiometric coefficients from the balanced equation to find which reactant runs out first.

Front

What is the molarity of a solution?

Back

Molarity is a measure of concentration, defined as the number of moles of solute per liter of solution (mol/L).

Front

How many moles are in 85 mL of 0.75M KOH?

Back

0.06375 mol.