In 2001, Nescafé® launched a self-heating can of coffee, called Hot When You Want. To heat up the coffee, a button was pressed which mixed the heating ingredients in a shell outside the can containing the coffee. The can warmed up 210 cm³ of coffee by 40°C. A single step mixed calcium oxide and water to produce calcium hydroxide and generate heat according to the reaction: CaO (s) + H₂O (1)→ Ca(OH)2 (aq) AH = -82 kJ/mol O a. Assuming that the density and heat capacity for coffee is the same as that of water, 4.18- calculate the energy (in J) needed to warm 210 cm³ of coffee by 40°C. g.K' O b. Use this value to hence calculate the minimum mass (in g) of CaO in the can for it to function as specified.
In 2001, Nescafé® launched a self-heating can of coffee, called Hot When You Want. To heat up the coffee, a button was pressed which mixed the heating ingredients in a shell outside the can containing the coffee. The can warmed up 210 cm³ of coffee by 40°C. A single step mixed calcium oxide and water to produce calcium hydroxide and generate heat according to the reaction: CaO (s) + H₂O (1)→ Ca(OH)2 (aq) AH = -82 kJ/mol O a. Assuming that the density and heat capacity for coffee is the same as that of water, 4.18- calculate the energy (in J) needed to warm 210 cm³ of coffee by 40°C. g.K' O b. Use this value to hence calculate the minimum mass (in g) of CaO in the can for it to function as specified.
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Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.160QP: A rebreathing gas mask contains potassium superoxide, KO2, which reacts with moisture in the breath...
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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.
Question
Transcribed Image Text:In 2001, Nescafé® launched a self-heating can of coffee, called Hot When You Want. To heat up the coffee, a button was pressed
which mixed the heating ingredients in a shell outside the can containing the coffee. The can warmed up 210 cm³ of coffee by
40°C. A single step mixed calcium oxide and water to produce calcium hydroxide and generate heat according to the reaction:
CaO (s) + H₂O (1) →→→ Ca(OH)2 (aq)
AH = -82 kJ/mol
J
g-K'
a. Assuming that the density and heat capacity for coffee is the same as that of water, 4.18-
calculate the energy (in J) needed to warm 210 cm³ of coffee by 40°C.
b. Use this value to hence calculate the minimum mass (in g) of CaO in the can for it to function as
specified.
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