Prelab Questions: (complete and show work) 1. Balance the following equation, which describes the decomposition reaction which happens when potassium chlorate is heated: 2_ KCIO316) → 2 _KCl(s) 3_O2ie) 2. You start with 2.46 g of KCIO315) and heat it. Use stoichiometry to calculate the mass (g) of KCI produced by the reaction? 2KCIO3 (s) --> 2KCI + 302 (122.55 g/mol)*2 (74.55 g/mol)^2 (155.999 g/mol)*6 2.46 * 74.55*2/ 122.55*2 = 1.4965 g of KCI 122.55'2 g of KCIO3 = 74.55'2 g KCI 2.46 g of KCIO3 produces 1.4965 g or 1.5 of KCI Mass lost as gas 3.) Calculate the % mass lost as O2 gas in the reaction. Percent Mass Lost = -x 100 Initial mass of solid
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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