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?
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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