a 0.271g sample of an unknown vapor occupies 294ml at 140C and 874mmHg. The emperical formula of the compound is CH2. How many moles of CO2 would be formed if 3moles of the compound react with oxygen?

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anonymous · Answer

I see an amount, a volume, temp, and pressure. PV=nRT time!$$PV= {grams \over molar \ mass}RT$$$$molar\ mass = {(grams) RT \over( molar\ mass)PV}$$ Once you have molar mass you  can find the molecular formula of the CH2. Then you right a balanced equation with the CH2 compound + oxygen goes to wawa(H20) and CO2. Then just use the molar ratio find moles of carbon dioxide. Donesies!

anonymous · Answer

I did mess up my second equation there shouldn't be another molar mass on the bottom.$$molar mass = {gramsRT \over PV}$$

anonymous · Answer

thanks so much, i get it now