Homework Help: chemistry

Posted by Sarah on Thursday, October 21, 2010 at 1:28pm.

Problem#9: Consider the fuel octane (the main component of gasoline) and its combustion reaction

2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(l)
ΔHo = -10,942 kJ

The “fuel value” of a fuel (unit kJ/g) is defined as the energy released when 1 g of the fuel undergoes combustion. Calculate the fuel value of octane. (MM of C8H18 = 114 g/mol)

chemistry - drwls, Thursday, October 21, 2010 at 1:56pm
Convert 1 g of octane to moles. Then multiply that by (1/2)*10,942 kJ, becasuse the reaction as written consumes 2 moles of octane.

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