2-methylbutane and 2,2-dimethyIpropane are isomeric hydrocarbons with the molecular formula C5H12 a)In an experiment to find the standard enthalpy of combustion (AH.") of both compounds, the temperature of 200 g of water was raised by 30 °C. The mass of 2-methylbutane burned was found to be 0.626 g and the volume of 2,2-dimethylpropane burned was 171 cm'. i)Calculate (in kJ) the heat given out by the 2-methylbutane in the experiment. ii)Use the data to calculate the standard enthalpy of combustion of 2-methylbutane and give your answer to 3 significant figures. iii)Calculate the standard enthalpy of combustion of 2,2-dimethyIpropane.

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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.