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Suppose that a stoichiometric mixture of Isooctane (C8H18) and air is burned in an engine and...

Suppose that a stoichiometric mixture of Isooctane (C8H18) and air is burned in an engine and then the fuel is changed to 10% (by liquid volume) ethanol and 90% by liquid volume isooctane. If the liquid volumetric fuel flow rate to the engine for the blended fuel is the same as the liquid volumetric flow rate for the neat fuel, what is the equivalence ratio of the blended fuel and air mixture in the engine?

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