Definitions
the calculation of quantities of any substances involved in a chemical reaction from the quantities of the other substances
What is Stoichiometry?
The first step to solving a stoichiometry problem.
What is balancing the equation?
The reactant that is used up.
What is limiting reactant?
Equal number of moles on reactants and products side.
What is a balanced equation?
Ratios of coefficients from balanced chemical equations aka conversion factors. Also ratio of moles from reactants and products.
What is reacting ratio?
The second step to balancing a stoichiometry equation.
What is converting units of your given substance into units of moles?
Calculate the amount of product that could be made from each reactant, assuming excess of the other one.
What is a way to calculate limiting reactant?
What is balancing an equation?
Any other reactant that is left over.
What is excess?
The third step to solving a stoichiometry equation.
What is calculating the moles of substances yielded by the reaction using the mole ratio?
Dividing the moles of each reactant by its coefficient in the balanced chemical equation.
What is an additional way to find limiting reactant?
Interpret the following balanced equation in words.
2 P(s) + 3 Cl2(g) → 2 PCl3(l)
What is two atoms of phosphorus react with three molecules of Cl2 to produce two molecules of PCl3?
OR
What is Two moles of phosphorus react with three moles of Cl2 to produce two moles of PCl3.
reactant that is completely used up in your first chemical equation.
What is the limiting quantity?
The fourth step to solving a stoichiometry equation.
What is converting moles of wanted substance to desired units?
Find the amount of each reactant needed to completely use up the other reactant. Disregard the scenario that requires more of a reactant than is actually present
What is another way to calculate limiting reactant?
Balance the equation.
H3PO4 + KOH → K3PO4 + H2O
What is H3PO4 + 3KOH → K3PO4 + 3H2O ?
When the limiting quantity is used up.
What is completion?
Calculate the number of H2 molecules produced from the reaction of 0.450 mol HCl with sufficient calcium. Given the equation below.
HCl(aq) + Ca(s) → H2(g) + CaCl2(aq)
What is 1.35×10^23 H2 molecules ?
After the reaction of 0.450 mol HF with 0.340 mol NaOH is complete, how much excess reactant remains? Use the given equation.
HF(aq) + NaOH(aq) → NaF(aq) + H2O(l)
What is .11 moles HF?
Balance the equation.
Al(s) + O2(g) → Al2O3(s)
What is 4 Al(s) + 3 O2(g) → 2 Al2O3(s) ?