Be sure to answer all parts. Isooctane (C8H18; d = 0.692 g/mL) is used as the fuel during a test of a new automobile engine. How much energy (in kJ) is released by complete combustion of 21.8 gal of isooctane to gases (ΔH o rxn = −5.44 × 103 kJ/mol)? Enter your answer in scientific notation.

Explanation:

Molar mass of isooctane will be 12*8+8=114 g/mole

Combustion of 21.8 gal yields energy of

21.8*3780*0.692*-5440/114=-2721124.6484210 J

In scientific notation, this is

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has mass of one amu