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Unformatted text preview: sample. How many grams of C is this? How about the hydrogen? Since one mole of H 2 O is made up of one mole of oxygen and two moles of hydrogen, if we have 0.017 moles of H 2 O, then we have 2*(0.017) = 0.034 moles of hydrogen. Since hydrogen is about 1 gram/mole, we must have 0.034 grams of hydrogen in our original sample. When we add our carbon and hydrogen together we get: 0.154 grams (C) + 0.034 grams (H) = 0.188 grams But we know we combusted 0.255 grams of isopropyl alcohol. The 'missing' mass must be from the oxygen atoms in the isopropyl alcohol: 0.255 grams - 0.188 grams = 0.067 grams oxygen This much oxygen is how many moles? Overall therfore, we have: 0.0128 moles Carbon 0.0340 moles Hydrogen 0.0042 moles Oxygen Divide by the smallest molar amount to normalize: C = 3.05 atoms H = 8.1 atoms O = 1 atom Within experimental error, the most likely empirical formula for propanol would be: C 3 H 8 O...
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- Fall '10