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Molecular Formula watch

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    10cm3 of a gaseous hydrocarbon were mixed with 45cm3 of oxygen and exploded in a reaction chamber. After cooling to room temperature, the residual gases occupied 30cm3. by absorption with NaOH solution, a decrease in volume of 20 cm3 was produced. the remaining gas was shown to be oxygen. Determine the molecular formula of the hydrocarbon. Pressure 1 atm
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    I started with the equation, etc but I'm lost. Additionally, my teacher gave us for homework and we haven't done the topic in class as yet
 
 
 
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