We subtract the enthalpies of the reactants from that of the products:
Since this is < 0, this is an exothermic reaction.
HCI is one of the most common acids out of the following
The standard atomic weight is the average mass of an element in atomic mass units ("amu"). Though individual atoms always have an integer number of atomic mass units, the atomic mass on the periodic table is stated as a decimal number because it is an average of the various isotopes of an element.
is the conjugate acid
, its conjugate base.
is the conjugate base of
, its conjugate acid.