Mole Ratio Calculation
Mole Ratio Calculation - Related Videos
02:56
Formula Mass and Mole Concepts of Compounds
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2020
Formula Mass of Covalent Compounds Chemical formulas represent the elemental makeup of substances. For covalent compounds, the formula represents the numbers and types of atoms composing a single molecule of the substance; therefore, the formula mass may be correctly referred to as a molecular mass. The molecular formula of chloroform (CHCl3), a covalent compound, indicates that a single molecule contains one carbon atom, one hydrogen atom, and three chlorine atoms. The average molecular mass...
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...
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...
02:45
Calculating pH Changes in a Buffer Solution
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2020
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
03:03
Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions
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2020
Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure. This means that in a mixture containing three different gases A, B, and C, if PA is the partial pressure of gas A; PB is the partial pressure of gas B; PC is the...
FAQs
The coefficients establish the fixed numerical relationship between substances in the reaction. For example, the coefficient of one substance can be compared with the coefficient of another to form a conversion factor. Multiplying a known amount in moles by that factor gives the corresponding amount required or produced, while keeping the reaction proportions defined by the equation.
Balancing establishes the coefficients that govern every later mole comparison. Without those coefficients, the calculation lacks the reaction-specific proportions needed to connect reactants and products. Once the equation is balanced, each coefficient can serve as part of a conversion factor, allowing measured quantities to be related consistently to the chemical reaction.
Each reactant amount can be compared with the amount required by the balanced equation. The reactant that cannot support the full reaction proportion is the limiting reactant, because it restricts how much product the stated reactant quantities can produce. This comparison distinguishes the available amounts from the reaction’s required stoichiometric relationship.
First, use the balanced chemical equation and locate the coefficients for the substances being compared. Then express the known quantity in moles and multiply by a coefficient ratio arranged so the original substance cancels. The resulting mole amount represents the related reactant or product and can support further yield or quantity calculations.
A known amount of reactant can be converted into the corresponding product amount through the coefficients of the balanced equation. When the limiting reactant has been identified, its available moles provide the basis for determining the maximum product amount predicted by the reaction. That prediction is the theoretical yield used for comparison with experimental results.
The method supports laboratory synthesis by relating reactant quantities to expected products, and it helps prepare solutions with reaction-specific amounts. It also contributes to chemical analysis by connecting measured quantities to equation-based relationships. In industrial process design, the same calculations help relate material amounts to the fixed proportions required by a chemical process.