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A sample of a compound containing only carbon and hydrogen

A 0.250g sample of a compound containing only carbon and hydrogen whose molecular weight is 16g/mol is burned in oxygen to yield 0.784g CO2 and 0,642g H2O. What is the molecular formula of the compound?

Solution Preview

Let call the unknown compound CxHy
The reaction is
CxHy + (x+y/4)O2 = xCO2 + (y/2)H2O
The mole of CxHy is =0.25/16=0.0156 (mol)
The mole of CO2 is ...

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