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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. Remember that for one mole of pentane, enough O has to be provided for 5 moles of CO2 and 6 moles of H2O. So adding up O's and dividing by two, you get 8O2. For 6.178 moles of pentane, multiply 8 by that number of moles. cattbarf Â· 7 years ago.