The summer before coming to school, you are lucky enough to get a job making coffee at Starbucks, but you tell your parents and friends you have secured a lucrative position as a “java engineer”. An eccentric chemistry professor (not mentioning any names) stops in every day and order 250.0 mL of house coffee at precisely 95 °C. He then adds enough milk at 10.0 °C to drop the temperature of the coffee to 90.0 °C. Calculate the amount of milk (in mL) the professor must add to reach this temperature. (Assume coffee and milk have the same specific heat capacity: 4.186 J/g °C. Assume that they also have the same density: 1.000 g/mL).
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 summer before coming to school, you are lucky enough to get a job making coffee at Starbucks,
but you tell your parents and friends you have secured a lucrative position as a “java engineer”. An eccentric
chemistry professor (not mentioning any names) stops in every day and order 250.0 mL of house coffee at precisely
95 °C. He then adds enough milk at 10.0 °C to drop the temperature of the coffee to 90.0 °C. Calculate the amount of
milk (in mL) the professor must add to reach this temperature. (Assume coffee and milk have the same specific heat
capacity: 4.186 J/g °C. Assume that they also have the same density: 1.000 g/mL).
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what is the ps? what about the specific heat of water which is 4.184 J/g C
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