Question

The complete combustion of octane, C8H18, a component of gasoline, proceeds as is shown below. 2...

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 1.90 mol of C8H18?

23.75 mol

(b) How many grams of O2 are needed to burn 2.50 g of C8H18?

8.75 g

(c) Octane has a density of 0.692 g/mL at 20°C. How many grams of O2 are required to burn 1.85 gal. of C8H18? 1 gal = 3.79 L.

___ g



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