The complete combustion of octane, C8H18, a component of gasoline, proceeds as is shown below. 2 C8H18(l) + 25 O2(g)  16 CO2(g) + 18 H2O(l) (a) How many moles of O2 are needed to burn 2.10 mol of C8H18? ____________mol(b) How many grams of O2 are needed to burn 1.25 g of C8H18? _________g(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 4.90 gal. of C8H18? 1 gal = 3.79 L. ______________g

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".