The enthalpy of fusion of water is 6.01 kJ/mol. Sunlightstriking Earth’s surface supplies 168 W per square meter(1 W = 1 watt = 1 J/s). (a) Assuming that melting of iceis due only to energy input from the Sun, calculate howmany grams of ice could be melted from a 1.00 squaremeter patch of ice over a 12-h day. (b) The specific heatcapacity of ice is 2.032 J/g °C. If the initial temperature ofa 1.00 square meter patch of ice is -5.0 °C, what is its finaltemperature after being in sunlight for 12 h, assuming nophase changes and assuming that sunlight penetrates uniformlyto a depth of 1.00 cm?
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 enthalpy of fusion of water is 6.01 kJ/mol. Sunlight
striking Earth’s surface supplies 168 W per square meter
(1 W = 1 watt = 1 J/s). (a) Assuming that melting of ice
is due only to energy input from the Sun, calculate how
many grams of ice could be melted from a 1.00 square
meter patch of ice over a 12-h day. (b) The specific heat
capacity of ice is 2.032 J/g °C. If the initial temperature of
a 1.00 square meter patch of ice is -5.0 °C, what is its final
temperature after being in sunlight for 12 h, assuming no
phase changes and assuming that sunlight penetrates uniformly
to a depth of 1.00 cm?
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