Iso-octane (C3H18) is combusted with air which is composed of 21% oxygen and 79%nitrogen (e.g. for every mole of O2 there are 3.76 moles of N2). Assume that combustion occurs

under stoichiometric conditions (e.g. the only products of this reaction are CO2,H2O, and N2). (i) Write an atom balanced chemical reaction equation. (ii) What is the air/fuel ratio on a MOLAR basis? (iii) What is the air/fuel ratio on a MASS basis? (iv) How do answers to (i), (ii), and (iii) change if iso-octane is burned in pure oxygen? Document answers to this part and subsequent parts of this homework using best practices from your analysis of the problem solving rubric.