this is the answers and working out to both questions
Gold/Atomic mass
196.96657 u ± 0.000004 u
Potassium/Atomic mass
39.0983 u ± 0.0001 u
Francium/Atomic number
87
Copper/Atomic mass
63.546 u ± 0.003 u
Bromine/Atomic mass
79.904 u ± 0.001 u
Arsenic/Atomic number
33
Exothermic reaction = the term exothermic process describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light, electricity,
Endothermic reaction = An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.
Answer:
entropy of reaction = 572-718= -146J/mol-k.
Explanation:
entropy of a reaction = entropy of product - entropy of reactant.
entropy of product = 2×entropy of SO2+2×entropy of NiO
=
=572 J/mol-k
entropy of reactant = 2×entropy if NiS+3×entropy of O2
=
=718 J/mol-k
therefore entropy of reaction = 572-718= -146J/mol-k.