Stoichiometry Calculation
Stoichiometry Calculation - Related Videos
02:57
Reaction Stoichiometry
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2020
A balanced chemical equation provides a great deal of information in a very succinct format. Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction. Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction. These quantitative relationships are known as the reaction’s...
02:46
Calculating the Equilibrium Constant
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2020
The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression. For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation: When 0.10 mol NO2 is added to a 1.0-L flask at 25 °C, the concentration changes so that at equilibrium, [NO2] = 0.016 M and [N2O4] = 0.042 M. The value of the...
03:40
Stoichiometry, Product Yield, and Limiting Reactants - Concepts
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2020
Chemical equations represent how a chemical reaction proceeds from reactants to products through physical or chemical change using chemical formulas. Stoichiometry is a term that describes the relative quantities of reactants and products in a chemical reaction. It is based on the Law of Conservation of Mass, which is a fundamental law that states that matter is neither created nor destroyed. Quite simply, the number and identity of reactant atoms must equal the number and identity of product...
16:03
Stoichiometry, Product Yield, and Limiting Reactants - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Synthesis of tris(ethylenediamine)nickel chlorideExpand In this lab, you will combine nickel chloride hexahydrate and ethylenediamine in water to produce tris(ethylenediamine)nickel chloride. When nickel chloride hexahydrate dissolves in water, it rearranges to become the hexaaquanickel cation and two chloride anions. Adding ethylenediamine results in three ethylenediamine molecules exchanging with the six water molecules. This...
03:12
Chemical Stoichiometry and Gases: Using Ideal Gas Law to Determine Moles
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2020
Chemical stoichiometry describes the quantitative relationships between reactants and products in chemical reactions. In addition to measuring quantities of reactants and products using masses for solids and volumes in conjunction with the molarity for solutions; now, the gas volumes can also be used to indicate quantities. If the volume, pressure, and temperature of a gas is known, then the ideal gas equation to calculate how many moles of the gas are present, can be used. Conversely, if the...
FAQs
The coefficients specify the relative mole amounts of every reactant and product in the reaction. A stoichiometry calculation uses these coefficients as conversion ratios, allowing the amount of one substance to be related quantitatively to another. Because the equation must be balanced first, the calculated relationships reflect the reaction’s stated composition rather than an arbitrary comparison of chemical formulas.
The limiting reagent determines how far the reaction can proceed when reactants are present in unequal amounts. Once its available amount is connected to the balanced equation’s mole ratios, the calculation can determine the corresponding product amount and indicate which reactant controls the outcome. This distinction separates the controlling material from reactants that remain in excess.
Theoretical yield is the product amount predicted from the balanced reaction and the available reactant quantities, including the limiting reagent when relevant. Comparing that prediction with the experimental result helps evaluate reaction efficiency. The comparison can show how closely the actual outcome matches the calculated expectation, providing a quantitative basis for interpreting laboratory performance.
A typical calculation starts with a balanced chemical equation, identifies the known substance and the requested quantity, and converts between mass, moles, and molar mass as needed. The appropriate coefficient ratio then connects the known substance to the target substance. This sequence provides a consistent route from measured material amounts to predicted reactant or product quantities.
For solution preparation, stoichiometric relationships connect the desired composition with the required material amounts. Conversions involving mass, moles, and molar mass help determine how much substance is needed before preparation. The same quantitative framework supports controlled composition, making it useful when researchers need solutions with planned amounts of chemical components.
Stoichiometric calculations help researchers plan reactant quantities, predict product amounts, and compare expected results with experimental data. During optimization, these relationships support adjustments intended to control composition and reduce material waste. In scale-up, they provide a quantitative basis for extending a reaction beyond its original size while maintaining the intended proportions of reactants and products.