Stoichiometrically Equivalent Molar Ratios from the Balanced Equation

Stoichiometrically Equivalent Molar Ratios from the Balanced Equation 

In a balanced equation, the number of moles of one substance is stoichiometrically equivalent to the number of moles of any other substance. The term stoichiometrically equivalent means that a definite amount of one substance is formed from, produces, or reacts with a definite amount of the other. These quantitative relationships are expressed as stoichiometrically equivalent molar ratios that we use as conversion factors to calculate these amounts. Table 3.3 presents the quantitative information contained in the equation for the combustion of propane, a hydrocarbon fuel used in cooking and water heating  

If we view the reaction quantitatively in terms of C3H8, we see that 1 mol of C3H8 reacts with 5 mol of O2 1 mol of C3H8 produces 3 mol of CO2 1 mol of C3H8 produces 4 mol of H2O Therefore, in this reaction, 

We chose to look at C3Hg, but any two of the substances are stoichiometrically equivalent to each other. Thus, 

Here s a typical problem that shows how stoichiometric equivalence is used to create conversion factors in the combustion of propane, how many moles of O2 are consumed when 10.0 mol of H2O are produced To solve this problem, we have to find the molar ratio between O2 and H2O. From the balanced equation, we see that for every 5 mol of O2 consumed, 4 mol of H2O is formed  

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Stoichiometrically Equivalent Molar Ratios from the Balanced Equation 89 Reactions That Involve a Limiting Reactant 93... 

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