Three alcohol solutions with varying concentrations were mixed together: Solution 1 is 160mL of water with 40mL alcohol; Solution 2 is 760mL with 12% alcohol; and Solution 3 is 1.025L with 5% alcohol. What is the final percent by volume of alcohol? 8.87% 9.02% 9.38% 9.19% 150 joules of heat was absorbed by the surrounding as 150 joules of work was done on the system. Which of the following is correct? Q is + ; W is + Q is + ; W is - Q is - ; W is - Q is - ; W is + How many grams of lead can be heated from 25˚C to 100˚C with 8.65kJ of energy? Specific heat capacity for lead = 0.13 J/g˚C 84,337.5 grams 887.18 grams 84.34 grams 8,817.72 grams

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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.