Stoichiometric calculations involve using balanced chemical equations and mole ratios to determine unknown quantities in chemical reactions from known values. The key tools needed are a balanced chemical equation, mole ratios based on the coefficients in the equation, and conversions between moles, grams, and molar mass. An example problem is provided that shows how to calculate the mass of sodium chloride products from a known number of moles of chlorine reactants using mole ratios from the balanced equation, molar mass, and stoichiometric relationships between coefficients. The mass to mass calculation process is similar, using inverse molar mass and molar mass conversions.

1. #2Stoichiometric CalculationsStoichiometric CalculationsBy:DeMontez Lamar#2#2By:DeMontez Lamar#2#2Stoichiometric Calculations = S.C

2. THE BASIKZ“Okay Lets Breakdown The Meaning Off Stoichiometric Calculations……”1stStoichiometric Comes From Stoichiometry Which Is The Branch Of Chemistry Concerned With Measuring The Proportions Of Elements That Combine During Chemical Reactions.2ndCalculation The Process Of Working Out The Answer To A Mathematical Problem.

3. Now that you know that you might ask ??What Tools Are Needed to Perform Stoichiometric Calculations??All S.C begin with a balanced chemical equation. Mole ratio based on Chem.-Equations are needed, as well as mass to mole.

4. ::Examplez::Answer on Next SlideMole-To-MassAnalyze1Known Moles of chlorine = 1.25 mol CI2 UnknownMass of sodium chloride = ? g NaCI2Solve1.25 mol Grams(g)2Na(s) = CI2(g)  2NaCI (s)Write the Balanced chemical equation, and Idnetify the known and the unknown values.2 mol NaCIMole Ratio: 1 mol CI2Multiply moles of CI2 by the mole ratio to get molesof NaCI2 mol NaCI=1.25 mol CI2 x 2.50 mol NaCI1 mol CI258.44g NaCIMultipy moles of NaCI by the molar mass to get grams of NaCI=2.50 mol NaCI2 x 146 g NaCI1 mol NaCI2

5. AnswerSince The Given # Of Moles has 3 significant figures, the mass of NaCI also has three. To Quickly assess whether the calculated mass value for NaCI is Correct, perform the calculations in reverse: divide the mass of NaCI by the molar mass of NaCI, and then divide the result by 2. You will get the given # of Moles CI2

6. Mass-To-MassMass-To-MassTHE STEPS 4 MASS TO MASS ARE SIMILAR Write the balanced chemical equation, and identify the known and unknown values THEN Multiply gram by the inverse of molar mass THEN Multiply mole of H2O by the molar mass

7. That’s all u need to know aboutStoichiometric Calculations