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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.
One mole of any substance contains 6.02 x 1023â¦ particles (similar to how a dozen is 12 of anything). Air is about 21% oxygen, depending upon your location and local biotic and abiotic factors. So, at STP, 1 liter of air is about 0.21 liters of oxygen. To find out how many moles that represents, divide 0.21 by 22.4. Take that answer and multiply by 6.02 x 1023. It should be a very large number, on the order of 1021.