?Natural gases are rarely pure methane; they usually also contain other light

Chapter 4, Problem 4.29

(choose chapter or problem)

Natural gases are rarely pure methane; they usually also contain other light hydrocarbons and nitrogen. Determine an expression for the standard higher heat of combustion as a function of composition for a natural gas containing methane, ethane, propane, and nitrogen. Assume liquid water as a product of combustion. Which of the following natural gases has the highest heat of combustion?

(a) \(y_{C H_{4}}  = 0.95, y_{C_{2}H_{6}}  = 0.02, y_{C_{3}H_{8}  = 0.02, y_{N_{2}}  = 0.01\).

(b) \(y_{C H_{4}}  = 0.90, y_{C_{2}H_{6}}  = 0.05, y_{C_{3}H_{8}  = 0.03, y_{N_{2}}  = 0.02\).

(c) \(y_{C H_{4}}  = 0.85, y_{C_{2}H_{6}}  = 0.07, y_{C_{3}H_{8}  = 0.03, y_{N_{2}}  = 0.05\).

Text Transcription:

y_CH_4  = 0.95, y_C_2H_ 6  = 0.02, y_C_3H_ 8  = 0.02, y_N_2  = 0.01

y_CH_4  = 0.90, y_C_2H_ 6  = 0.05, y_C_3H_ 8  = 0.03, y_N_2  = 0.02

y_CH_4  = 0.85, y_C_2H_ 6  = 0.07, y_C_3H_ 8  = 0.03, y_N_2  = 0.05

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