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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. 1 mole = 6.02x10Â²Â³ units 1 mole of oxygen atoms = 16 grams 1 mole of oxygen molecules = 32 grams When you are doing empirical formulas, you are interested in the number of atoms of each element. Chris Â· 7 years ago. Thumbs up. 1.