Molar mass of butane =58.12
12/58.12=0.21mol
Molar mass of O2= 31.998
12/31.998=0.38mol
Molar mass of CO2= 44.01
Mole ratio CO2:O2= 8:13
Mole ratio CO2: C4H10=8:2
= 4.615Γ44.01Γ0.59=119.83g
Molar mass of H2O=18.01528
Mole ratio H2O:O2 =10:13
Mole ratio H2O: C4H10=10:2
5.77Γ18.01528Γ0.59=61.33g