Macmillan The temperature of a sample of iron increased by 23.7 °C when 261 J of heat was applied. What is the mass of the sample? m = TOOLS x10' 5.0 g Substance Specific heat J/(g. °C) lead 0.128 silver 0.235 0.385 0.449 0.903 copper iron aluminum
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.
The temperature of a sample of iron increased by 23.7 °C23.7 °C when 261 J261 J of heat was applied.
What is the mass of the sample?
Amount of heat,Q required to raise the temperature of a substance of mass ,m and specific heat capacity, C from temperature T1 to temperature T2 is calculated by formula :
Q = m C ( T2 - T1 )
Q = m C ( ∆T )
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