How is the enthalpy of reaction related to the enthalpies of formation for the products and reactants?

Explanation:

The enthalpy of reaction is the change of enthalpy of the chemical reaction. It is equal to the heat released or absorbed during the chemical reaction.

The enthalpy of reaction is equal to the difference of the enthalpy at the end of the reaction and the enthalpy at the begining of the reaction.

Since the substances at the end are the products, and the substances at the begining are the reactants, this is equivalent to say that the enthalpy of reaction is equal to the enthalpy of formation for the products less the enthalpy of formation for the reactants.

In the form of equation that is:

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.