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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.
For example, n-hexane, a chemical compound has the molecular formula CH3CH2CH2CH2CH2CH3, implying that it has a straight chain structure, 6 carbon atoms, and 14 hydrogen atoms. Hexane's molecular formula is C6H14, and its empirical formula would be C3H7 showing a C:H ratio of 3:7.As you have asked Benzene that is C6H6 Here the ratio of carbon and hydrogen is 1:1 And Acetylene that is C2H2 Here also the ratio is 1:1 Hence the empirical formula is the same but different masses.I hope you get it.oth have the same number of carbon (C) and hydrogen atoms (H). But benzene's formula is C6H6; acetylene is C2H2. A single molecule of benzene has exactly 3 times as many atoms as acetylene. So a mole of benzene will have 3 times the mass.