If the heat of combustion of 1-butanol (C4H9OH) is 2,710 kJ/mol, what mass of oxygen is consumed when enough 1-butanol is burned to yield 26,400 kJ of energy?

Question

I have no clue where to begin I thought to use enthalpy but it didnt work

Answer 1

I worked this problem for you about 4 or 5 yours ago. Here is a link.
https://www.jiskha.com/display.cgi?id=1512514097

Answer 2

LOL. HOURS ago.