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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.
Best Answer: Let's begin with the information we want and the information we have. We want: -The number of atoms of oxygen in 16.00 grams of water (H2O) We have: - Ratio of oxygen atoms in each molecule of water (From formula, it's 1 oxygen to 2 hydrogen) - Atomic masses of oxygen and hydrogen. - From avogadro's number, the number of atoms in one unit of moles is 6.02 x 10Â²Â³.