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Chapter 4 Stoichiometry of Chemical Reactions 199 What mass of gallium oxide, Ga2O3, can be prepared from 29.0 g of gallium metal? The equation for the reaction is 4Ga + 3O2 ⟶ 2Ga2 O3. Answer: 39.0 g Example 4.11 Relating Masses of Reactants What mass of oxygen gas, O2, from the air is consumed in the combustion of 702 g of octane, C8H18, one of the principal components of gasoline? 2C8H18 +25O2 ⟶ 16CO2 +18H2O Solution The approach required here is the same as for the Example 4.10, differing only in that the provided and requested masses are both for reactant species. 702 g C8 H18 × 1 mol C8 H18 × 25 mol O2 × 32.00 g O2 = 2.46 × 103 g O2 114.23 gC8H18 2 molC8H18 molO2 Check Your Learning What mass of CO is required to react with 25.13 g of Fe2O3 according to the equation Fe2 O3 + 3CO ⟶ 2Fe + 3CO2 ? Answer: 13.22 g These examples illustrate just a few instances of reaction stoichiometry calculations. Numerous variations on the beginning and ending computational steps are possible depending upon what particular quantities are provided and sought (volumes, solution concentrations, and so forth). Regardless of the details, all these calculations share a common essential component: the use of stoichiometric factors derived from balanced chemical equations. Figure 4.10 provides a general outline of the various computational steps associated with many reaction stoichiometry calculations.PDF Image | Stoichiometry of Chemical Reactions
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