If the heat of combustion for a specific compound is -1320.0 kj/mol and its molar mass is 71.83 g/mol, how many grams of this compound must you burn to release 543.00 kj of heat?

Heat released from combustion is calculated by multiplying the amount of substance being burned with its heat of combustion. From this, we can calculate the mass needed from the system above. The calculation is as follows:

-543 kJ = x x -1320 kJ/mol
x = 0.411 mol 

Mass of x = 0.411 x 71.83 g/mol
Mass of x = 29.55 g 

The answer is a.  i hope this