so the first thing you need to do is figure out the formula for sucrose if you don't have it memorized. secondly, remember that combustion will have oxygen as a reactant (why you put a blanket over a fire). and then the products would be CO2 and H2O. so your formula after balancing would be
C12H22O11 + 12O2 --> 12CO2 + 11H2O
54.5g sucrose = .16 moles sucrose
once you do that, you can use conversion factors with the given mole ratios (12:1). in essence, you are multiplying the moles of sucrose by 12
12 x .16 = 1.92 moles of CO2
feel free to reach out if you have any issues with questions like this.
