posted by Robert .
If the heat of combustion for a specific compound is -1250.0 kJ/mol and its molar mass is 35.39 g/mol, how many grams of this compound must you burn to release 352.40 kJ of heat?
1250.0 kJ/mol x # mol = 352.40 kJ
Solve for # mols.
Then mol = grams/molar mass. You know mols and molar mass, solve for grams.