• anonymous
a compound contains only carbon, oxygen, hydrogen. A 5.000 g sample of the compound is combusted and 6.638 L of carbon dioxide ( 1.15 atm and 298 K) and 5.621 of water are produced . The molecular weight of the compound is app 128 g/mol. Determine the molecular formula of the compound.
  • Stacey Warren - Expert
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  • jamiebookeater
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  • JFraser
use the ideal gas law to find moles of \(CO_2\) produced. Use the mass percent of C in \(CO_2\) to find the mass of C that came from the sample. Do the same thing with the water. The rest of the 5.00g sample must come from the oxygen. Once you have a mass of each element, C, H, and O, convert to moles, then divide by the smallest to find a whole # mole ratio. The molecular formula will be a whole # multiple of the lowest whole # ratio, so that the ratio \(\frac{MF}{EF}\) is a small whole #.

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