The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances in their standard states at 25°C, is called . A) heat of solidification
B) standard heat of formation
C) enthalpy
D) heat of reaction

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

the ratio of the conjugate base to the acid required to attain the desired ph.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.