Question

Problem: Bapco needs to burn natural-gas fuel that contains 75 mol% methane, 15 mol% ethane, and 10 mol% nitrogen. The following two reactions takes place: CH4(g) 20209) CO2(0) 2H2o) C2H6 (g) + 3.502(g) 2C02(g)3H20 (g) a) What is the standard heat of combustion (kJ/mol) of the fuel at 25 oC with water(g) as a product b) The fuel is supplied to a furnace with 60% excess air, both entering at 250C. The products leave at 600°C. If the combustion is complete and if there no side reactions occur, how much heat (k]/mol of the fuel) is transferred in the furnace?

Answer 1

Solution:

Given that:

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tlere negattve in mean< that heat 「 Hear hased per mol o elhane mehane o rn Second veaetio med - 5 mole ome amount-of the ner71 w?lt be Cued tom vaporeze忭ye wat r because Wata 9a4Tche Wal

the a moun O eaifs one moe ot the ons 个1万e Combustion an.. Reacti ern second e_aeTr We have Goy. exceLL 아 Oxygen The mole of- oxHaen -

Moles obN2 along wth oxy 12 mole F one mou 02N2 be3.16 AssumTng 100% reaction motes umatt the Procdust 1+12 : 21 mole brom the econd reautton 11.95 mole」 Mole o Ca2 Foma Total Motes: 1.05 + -9S motesos +-26.35

i 16. 35 0-4 f 3 12-15 ction 2- Moe 1.95-16-35「 0.12 moe roo1o 2105 16 30 06 From ltteratare we can bind epehtc Value (cpx) ese components and speetic heat 아 02. specibic heat 아 H20 36 26 ㅈ0.12 t 42.4 0.064 3096 3 mole K moles x cp aveak ay luaudt Amount o he ener 16. 65 X 30 A6 x (600 -3) 276. 5kJ Amount ob ener eneny to incwax -er 613.5-29ς.S. 31 KT molo the temp