What does the symbol ∆H stand for?

one Calorie given off by a reaction

the heat capacity of a substance***

the heat of a reaction for a chemical reaction

the specific heat of a substance

The heat of a reaction for a chemical reaction.

The symbol ∆H stands for the heat of a reaction in a chemical reaction. It represents the change in enthalpy, which is the total heat content of a system. It can be measured in various units, such as joules (J) or calories (cal).

To determine the value of ∆H for a chemical reaction, you would typically need to know the amount of heat absorbed or released during the reaction. This can be measured experimentally using a calorimeter or calculated using heat capacity or specific heat.

The correct answer is "the heat of a reaction for a chemical reaction."

The symbol ∆H typically represents the heat of a reaction (also known as the enthalpy change) for a chemical reaction. It quantifies the amount of heat energy gained or lost during a reaction. So, the correct answer is: the heat of a reaction for a chemical reaction.