Home Early recorded sounds & wax cylinders Cylinder music shop An Edison commemorative 2nd page Note to early recordings collectors Cylinder of the month Links to related topics What's new Tinfoil resource center Cylinders of the month archive CJ's comics Copyright (C) (P) 1996-2015 Glenn Sage, Portland, Oregon.
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.
Thus, the heat of combustion of pentane is â782 kcal/mole, but that of its 2,2-dimethylpropane (neopentane) isomer is â777 kcal/mole.Differences such as this reflect subtle structural variations, including the greater bond energy of 1Âº-CâH versus 2Âº-CâH bonds and steric crowding of neighboring groups.hus, the heat of combustion of pentane is â782 kcal/mole, but that of its 2,2-dimethylpropane (neopentane) isomer is â777 kcal/mole.