Formulate the equations of the stoichiometric coefficients for stoichiometric combustion (in air) of a generic fuel CxHyOz, where x, y, and z may be any nonnegative integer for pure fuels, or non-negative real numbers for fuel blends. Also, formulate the equations for the mixture molecular mass, mole factions, and mass fractions of the combustion products H2O, CO2, and N2 and the fuel-to-air ratio. Using the formulations, compute the stoichiometric coefficients, mixture molecular mass, mole factions, and mass fractions for methane (CH4) and biodiesel (C19H36O2) fuels.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.