Final answer:
The heat generated when 100g of a compound is combusted depends on the specific enthalpy of combustion of that compound, which varies for different substances. The correct answer is a. Depends on the specific compound.
Step-by-step explanation:
The amount of heat generated when 100g of a compound is combusted in excess oxygen depends on the specific compound being combusted. This is because each compound has a unique enthalpy of combustion, which is the heat released when one mole of the compound is burned in excess oxygen.
For example, the enthalpy of combustion per mole of methane can be determined by performing a combustion reaction under specific conditions, such as in a bomb calorimeter, and measuring the temperature change to calculate the amount of heat produced.
When a compound is combusted in excess oxygen, the amount of heat generated depends on the specific compound. Each compound has its own enthalpy of combustion, which is the amount of heat released when one mole of the compound is completely burned.
Therefore, the heat generated when 100g of a compound is combusted in excess oxygen can only be determined by knowing the specific compound.