A substance has a melting point of 20°C and a boiling point of 150°C. The latent heat of fusion of 3.5 x 104 J/kg and the latent heat of vaporization of 7.0 x 104 J/kg. The specific heat for the solid phases is 600 J/(kg °C). The specific heat for the liquid phase is 1050 J/(kg °C) and the specific heat for the gas phase is 400 J/(kg °C). The specific heat capacity for water is 4190 J/(kg °C). Water has a melting point of 0°C and a boiling point of 100° C. What mass of water initially at a temperature of 70° was added to 0.50 kg of the substance, at a temperature of 16°C, if the final temperature is measured to be 30°C. Assume no heat was lost to the surroundings or the container. Give the mass in Kg stated to 3 decimal places.
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.
A substance has a melting point of 20°C and a boiling point of 150°C. The latent heat of fusion of 3.5 x 104 J/kg and the latent heat of vaporization of 7.0 x 104 J/kg. The specific heat for the solid phases is 600 J/(kg °C). The specific heat for the liquid phase is 1050 J/(kg °C) and the specific heat for the gas phase is 400 J/(kg °C).
The specific heat capacity for water is 4190 J/(kg °C). Water has a melting point of 0°C and a boiling point of 100° C.
What mass of water initially at a temperature of 70° was added to 0.50 kg of the substance, at a temperature of 16°C, if the final temperature is measured to be 30°C. Assume no heat was lost to the surroundings or the container.
Give the mass in Kg stated to 3 decimal places.
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