1. The problem statement, all variables and given/known data Q. A Hydrocarbon (CnHm) is burned completely in oxygen to produce a mixture of CO2 and H2O. The total pressure of mixture is 1.200 atm and partial pressure of H2O is 0.686 atm. What is empirical formula of Hydrocarbon 2. Relevant equations pV=nRT pa/ptotal = na/ntotal 3. The attempt at a solution The answer is C3H8 aka Propane Im so confused! I don't even know where to start with this!!