B Given the enthalpy changes H1, and H2, below, construct a Hess's cycle that will enable you to find the enthalpy change, Hr, for the reaction:
MgCO3(s) → MgO(s) + CO2(g) ΔΗr,
,
MgCO3(s) + 2HCl(aq) → MgCl2(aq) + CO2(g) + H2O(l) ∆H1,
MgO(s) + 2HCl(aq) -> H2O(l) + MgCl(aq)​ ∆H2

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.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

c

explanation:

4d^55s^1 ( third choice)