{"id":123494,"date":"2018-02-20T23:50:30","date_gmt":"2018-02-20T23:50:30","guid":{"rendered":"https:\/\/writemyessayfree.com\/combustion-of-hydrocarbons-in-ideal-dry-air-4"},"modified":"2017-08-12T07:47:17","modified_gmt":"2017-08-12T07:47:17","slug":"combustion-of-hydrocarbons-in-ideal-dry-air-4","status":"publish","type":"post","link":"https:\/\/www.benedictsol.com\/blogs\/combustion-of-hydrocarbons-in-ideal-dry-air-4\/","title":{"rendered":"Combustion of hydrocarbons in ideal dry air"},"content":{"rendered":"
\n ‘
\n ‘
\n February 20, 2017<\/time>\n <\/div>\n

<'\">
\n <\/i>0<\/span><\/a>\n <\/div>\n

\n <\/span> <\/span> 0<\/span> <\/a>\n <\/div>\n
\n <\/span>
\n Services<\/a>\n <\/div>\n<\/p><\/div>\n

Combustion of hydrocarbons in ideal dry air<\/h2>\n

In class we discussed stoichiometric (ideal) combustion of hydrocarbons in ideal dry air, and introduced the equivalence ratio F. Consider the combustion of hydrocarbon CxHy, where x and y are known for a given hydrocarbon (e.g., for methane, CH4, x = 1, y = 4). The general equation for non-ideal combustion of hydrocarbon CxHy is CxHy +a(O2+3.76N2) = bCO2+cH2O+dN2 +eCO+fO2 +trace where molar coefficients a, b, c, d, e, and f need to be calculated to balance the equation, and \u201ctrace\u201d means small quantities of other pollutants, such as alcohols, NOx, aldehydes, etc.<\/p>\n

(a) Generate algebraic expressions for coefficients a, b, c, d, e, and f as functions of each other and of (known) x and y as far as possible. In particular, provide equations for b, c, d, and f as functions of x, y, a, and e. Hint: You will not be able to solve explicitly for all the coefficients, since there are 6 unknowns and only 4 elements in the equation with which to generate expressions (C, H, O, and N).<\/p>\n

(b) Consider the stoichiometric case in which there is no excess air, a = astoich, and there is no CO or excess air on the RHS (e = f = 0). Generate expressions for coefficients a (a = astoich), b, c, and d as functions of only x and y.<\/p>\n

(c) Gasoline is mostly octane, C8H18. For octane, calculate the molar coefficients and write the final chemical equation for the stoichiometric case.<\/p>\n

(d) Now consider combustion of octane with F = 0.833333\u2026 Also, molar coefficient e is known to be 2 in this particular case. Calculate the molar coefficients and write the final chemical equation for this case. Is this rich or lean combustion?<\/p>\n

(e) Calculate the mol fraction of CO (in PPM) of the exhaust gas products of the case of Part (d).<\/p>\n

\n
\n

Share this:<\/h3>\n
\n