Equimolar amounts of H2(g) and Br2(g) are injected into an evacuated, rigid container, where they react according to the equation below. H2(g)+Br2(g)⇄2HBr(g) ΔHorxn =−72.4 kJ/molrxn (a) If 1.6 g of Br2 is consumed in the reaction with excess H2, how many moles of HBr are produced? BoldItalicUnderlineSuperscriptSubscriptUndoRedoΩBullet listNumbered listImage (12 image limit) Edit imageView imageDelete image .02 Mol HBr 3 / 10000 Word Limit3 words written of 10000 allowed Question 2 (b) Which element is reduced in this reaction? Justify your answer in terms of the oxidation numbers. BoldItalicUnderlineSuperscriptSubscriptUndoRedoΩBullet listNumbered listImage (12 image limit) Edit imageView imageDelete image
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.
Equimolar amounts of H2(g) and Br2(g) are injected into an evacuated, rigid container, where they react according to the equation below.
H2(g)+Br2(g)⇄2HBr(g) ΔHorxn =−72.4 kJ/molrxn
(a) If 1.6 g of Br2 is consumed in the reaction with excess H2, how many moles of HBr are produced?
.02 Mol HBr
Question 2
(b) Which element is reduced in this reaction? Justify your answer in terms of the oxidation numbers.
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