which statement about $delta h_f$ is true?\nit is positive when the bonds of the product store more energy…
which statement about $delta h_f$ is true?\nit is positive when the bonds of the product store more energy than those of the reactants.\nit is zero for any pure substance in its standard state.\nit is negative when a compound forms from elements in their standard states.\nit is zero for any compound that is in the liquid state.
Answer
Brief Explanations:
The standard enthalpy of formation ($\Delta H_f$) is positive when the bonds of the product store more energy than those of the reactants. This is because energy is absorbed to form the product with higher - energy bonds. For a pure substance in its standard state, $\Delta H_f = 0$ only for elements, not all pure substances. When a compound forms from elements in their standard states, $\Delta H_f$ can be positive or negative depending on the reaction. And $\Delta H_f$ is not zero for any compound in the liquid state.
Answer:
It is positive when the bonds of the product store more energy than those of the reactants.