Introduction A fuel is burnt and as much of the energy released as possible is transferred to water by heating. Using the fact that 4.18 J of energy are required to raise 1 g of water by 1 °C, the amount of energy given out by the fuel can be calculated. This can then be converted to the amount of energy given out per mole in order to calculate the enthalpy change of combustion of the fuel. Pre-lab questions 1 The water is contained in a metal can. Why is a metal can used and not a glass beaker or other similar container? Ethanol and propanol were chosen for this experiment as they are members of a homologous series. Identify the homologous series to which they belong and give the next member of the series. One of the biggest causes of error in this experiment is heat loss. Does this lead to systematic or random errors? Suggest how these errors could be decreased.

Q: Given the following thermochemical equations, NO(g) + O3(g) →NO2(g) + O2(g) ΔH = −198.9 kJ/mol…

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Q: Use the chemical equations shown below to determine the enthalpy for the final reaction: C₂H₂(g) +…

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Q: 5. In question 1, you calculated the enthalpy change for the combustion of propane from combining 3…

A: The objective of the question is to calculate the standard enthalpy change for the combustion of…

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.