Calculate the enthalpy amount resulting from the combustion of 4 moles of methane gas at 298 K with 50% less oxygen. Also find the percent efficiency of combustion.

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4 mol metan sarinin (CH4)298K de %50 az oksijen ile yanmasi senucu meydana gelen entalpi miktanini hesaplayinid. Aynica yar manin yuzde (%) verimlilisint bulunud. Verilenter CH4+O2CO2+H2O H298of(CO2)=94,050Kkal/mol H298cf(H2O)=57,800kkal/mol H298of(CH)=17,890kkal/mol Cp(C2)=10,55+2,16103T Cp(H2O)=7,17+2,56103T Cp(CH4)=5,65+11,44103T cp(O2)=7,16+1,001031 cp(N2)=6,66+1,02103T Cp(H2)=6,92+1,0O103T