A sample of aluminum absorbs 136 J of energy and the temperature increases from 24.11 °C to 30.41 °C. What is the mass (g) of the sample? The specific heat of aluminum is 0.902 J/g °C. O 41.8 g O 77.3 g O 54.1 g O 23.9 g
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.
Heat capacity is the amount of heat required to raise the temperature by one degree Celsius. Speciific heat capacity is the amount of heat required by 1 kg of a substance to raise the temperature by one degree Celsius. Different materials have different specific heat capacity. The equation to calculate specific heat capacity is:
Where,
The specific heat capacity is Cp.
The heat transferred in Joules is Q
The mass in kg is M.
The change in temperature in degree Celsius is ∆T.
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