Recent content by fabrave21

figured out number 2. Still don't get number 7

2 question I don't get ... =\ any help would be appreciated. I don't even know where to start ... Homework Statement 2. A sample of a hydrocarbon is combusted completely in O2 to produce 21.83 g CO2, 4.47 g H2O and 311 kJ of heat. A) What is the mass of the hydrocarbon sample that was...