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.
Simplest ratio between O and H: 3.33 moles O/6.65 moles H = 1 mol O/2 mol H. The ratio between O and H is 1 mole O for every 2 moles of H. Step 3: Find the empirical formula. We have all the information we need to write the empirical formula. For every 2 moles of hydrogen, there is one mole of carbon and one mole of oxygen.