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1) That looks right. 2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol. Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen. Step 3: 16= 9.6*10^24. 3) The ratio of oxygen to carbon in CO2 is 1:2. so it's 192/3 = 64.
Isomers. Pentane is one of three structural isomers with the molecular formula C5H12, the others being isopentane and neopentane.The branched isomers are more stable than pentane, which means that they have lower heat of formation and heat of combustion.sopentane is more stable than pentane by 1.8 kcal/mol, and neopentane by 5 kcal/mol. A related cycloalkane is cyclopentane, although this is not an isomer of pentane as its molecular formula is different, cyclopentane is an isomer of the pentenes.