Question

An unknown hydro carbon(CxH2x+2) was collected and the molar heat of combustion was determined to be 4150 kilojoules per mole. This value matches the unknown molar heat of combustion for hexane (C6H14).
You decide to find the molar mass of unknown hydrocarbon to verify it is hexane.
Data ..Burned unknown mass= 27.09 grams
Molar heat of combustion unknown-above
Liters of water heated= 5.65
Change in temp of water= 55.4 degrees Celsius
Heat capacity of water= 4.184 j/gdegrees Celsius
Molar mass of hydrocarbon using data?
Molar mass of hexane using periodic table?
Is unknown hexane?

Answer 1

How did you get hexane?

Answer 2

You can always start by writing down the balanced chemical formula for the combustion of \(\sf \color{red}{hexane}\), which is

\(\sf \color{red}{C_6H_{14} +}O_2 \rightarrow CO_2 + H_2O\)

Answer 3

I did not balance it, I will leave that up to you to figure out since it might benefit you far more if you did it rather than me.