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Density of hydrocarbons?


Theophrastus
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First, you want to assume that you have a pure substance. You can use the ideal gas law (another assumption) to calculate the number of moles. Assume any volume you like, eg 1 L, since it will cancel out.

 

Now you can get the molecular weight. So long as it is small enough and you know that it's made of only C and H (which should be, since it says simple hydrocarbon) you can work out the chemical formula.

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