In one box of nails, there are 75 iron nails weighing 0.250 lb. The density of iron is 7.86 g/cm3. The specific heat of iron is 0.452 J/g °C. The melting point of iron is 1535 °C. a. What is the volume, in cubic centimeters, of the iron nails in the box? b. If the nails are pure iron, how many moles of iron are in the box? c. If 30 nails are added to a graduated cylinder containing 17.6 mL of water, what is the new level of water, in milliliters, in the cylinder? d. How much heat, in joules, must be added to the nails in the box to raise their temperature from 16 °C to 125 °C? d)
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.
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