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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.
Report Abuse. This Site Might Help You. RE: The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25Â°C is req The mole fraction of oxygen molecules in dry air is 0.2095.What volume of dry air at 1.00 atm and 25Â°C is req. The mole fraction of oxygen molecules in dry air is 0.2095.ource(s): mole fraction oxygen molecules dry air 0 2095 volume dry air 1 00 atm 25 req: https://tr.im/Ht6P3. Kellby Â· 2 months ago.