In acidic conditions, manganate(VII) ions are reduced to manganese(II) ions, Mn. In neutral conditions, manganate(VII) ions are reduced to manganese(IV) oxide, MnO₂. 22.0 cm³ of a solution of manganate(VII) ions were needed to oxidise 25.0cm' of a solution of iron(II) ions to iron(III) ions in acidic conditions. The same solution of manganate(VII) ions is used to oxidise 25.0 cm³ of the same solution of iron(II) ions in neutral conditions. By considering the oxidation number changes involved, it may be shown that the volume of the manganate(VII) solution required, in neutral conditions, is A 12.6cm' B 13.2 cm³ C 36.7 cm¹ D 38.5 cm³ Could you please explain how is the correct answer C?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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